Merge mozilla-central to b2g-inbound

b2g/dev/config/tooltool-manifests/linux64/releng.manifest

@@ -15,8 +15,8 @@
 "unpack": true
 },
 {
-"size": 73029932,
-"digest": "ef1818acf065838dcb72554e521f9fd7098f0a3690cb6a3106d7bf18f46c342bfdd5a2b7d86e92ee3ddb9e478380343e58ecf8fd242807b8881a2d53fbec5ab3",
+"size": 193213220,
+"digest": "58b8ebd8de923117831dcbba71172a53e26c25bd16c2b2bb363a1254f2cd4e87f95e2c5f41e2dce10e18e43a17e0a395637c9ddcbf1e27673582792f9095c62e",
 "algorithm": "sha512",
 "filename": "rustc.tar.xz",
 "unpack": true

browser/base/content/browser.js

@@ -5197,8 +5197,10 @@ var TabletModeUpdater = {
 };
 
 var gTabletModePageCounter = {
+  enabled: false,
   inc() {
-    if (!AppConstants.isPlatformAndVersionAtLeast("win", "10.0")) {
+    this.enabled = AppConstants.isPlatformAndVersionAtLeast("win", "10.0");
+    if (!this.enabled) {
       this.inc = () => {};
       return;
     }
@@ -5214,8 +5216,11 @@ var gTabletModePageCounter = {
   },
 
   finish() {
-    Services.telemetry.getKeyedHistogramById("FX_TABLETMODE_PAGE_LOAD").add("tablet", this._tabletCount);
-    Services.telemetry.getKeyedHistogramById("FX_TABLETMODE_PAGE_LOAD").add("desktop", this._desktopCount);
+    if (this.enabled) {
+      let histogram = Services.telemetry.getKeyedHistogramById("FX_TABLETMODE_PAGE_LOAD");
+      histogram.add("tablet", this._tabletCount);
+      histogram.add("desktop", this._desktopCount);
+    }
   },
 };
 

browser/base/content/tabbrowser.xml

@@ -4691,6 +4691,9 @@
           let hoveredTab = this._hoveredTab;
           if (hoveredTab) {
             hoveredTab._mouseleave();
+          }
+          hoveredTab = this.querySelector("tab:hover");
+          if (hoveredTab) {
             hoveredTab._mouseenter();
           }
         ]]></body>

browser/config/tooltool-manifests/linux64/releng.manifest

@@ -14,17 +14,17 @@
 "unpack": true
 },
 {
+"size": 193213220,
+"digest": "58b8ebd8de923117831dcbba71172a53e26c25bd16c2b2bb363a1254f2cd4e87f95e2c5f41e2dce10e18e43a17e0a395637c9ddcbf1e27673582792f9095c62e",
+"algorithm": "sha512",
+"filename": "rustc.tar.xz",
+"unpack": true
+},
+{
 "size": 167175,
 "digest": "0b71a936edf5bd70cf274aaa5d7abc8f77fe8e7b5593a208f805cc9436fac646b9c4f0b43c2b10de63ff3da671497d35536077ecbc72dba7f8159a38b580f831",
 "algorithm": "sha512",
 "filename": "sccache.tar.bz2",
 "unpack": true
-},
-{
-"size": 73029932,
-"digest": "ef1818acf065838dcb72554e521f9fd7098f0a3690cb6a3106d7bf18f46c342bfdd5a2b7d86e92ee3ddb9e478380343e58ecf8fd242807b8881a2d53fbec5ab3",
-"algorithm": "sha512",
-"filename": "rustc.tar.xz",
-"unpack": true
 }
 ]

browser/config/tooltool-manifests/macosx64/releng.manifest

@@ -10,8 +10,8 @@
 "unpack": true
 },
 {
-"size": 128301120,
-"digest": "d2d71103a6cec84b150b8f08bfef2682aa713c2d6eadce584f79836ef27ba4380ffb444165d999b79605f18ad165641a7a8cc0e04a201675ad5f655a59adbda9",
+"size": 215952362,
+"digest": "5e9825dbe83b2a157879076da70fc5c989a1638e30d3b14a9901b166db09013c356a9dc4eaf6c16209a1832d9cb1c67ca869e9b9003cab8355a7f03b3dc08775",
 "algorithm": "sha512",
 "filename": "rustc.tar.bz2",
 "unpack": true

browser/experiments/Experiments.jsm

@@ -30,6 +30,8 @@ XPCOMUtils.defineLazyModuleGetter(this, "TelemetryEnvironment",
                                   "resource://gre/modules/TelemetryEnvironment.jsm");
 XPCOMUtils.defineLazyModuleGetter(this, "TelemetryLog",
                                   "resource://gre/modules/TelemetryLog.jsm");
+XPCOMUtils.defineLazyModuleGetter(this, "TelemetryUtils",
+                                  "resource://gre/modules/TelemetryUtils.jsm");
 XPCOMUtils.defineLazyModuleGetter(this, "CommonUtils",
                                   "resource://services-common/utils.js");
 XPCOMUtils.defineLazyModuleGetter(this, "Metrics",
@@ -160,10 +162,6 @@ function loadJSONAsync(file, options) {
   });
 }
 
-function telemetryEnabled() {
-  return gPrefsTelemetry.get(PREF_TELEMETRY_ENABLED, false);
-}
-
 // Returns a promise that is resolved with the AddonInstall for that URL.
 function addonInstallForURL(url, hash) {
   let deferred = Promise.defer();
@@ -389,7 +387,7 @@ Experiments.Experiments.prototype = {
     this._shutdown = false;
     configureLogging();
 
-    gExperimentsEnabled = gPrefs.get(PREF_ENABLED, false);
+    gExperimentsEnabled = gPrefs.get(PREF_ENABLED, false) && TelemetryUtils.isTelemetryEnabled;
     this._log.trace("enabled=" + gExperimentsEnabled + ", " + this.enabled);
 
     gPrefs.observe(PREF_LOGGING, configureLogging);
@@ -580,7 +578,7 @@ Experiments.Experiments.prototype = {
   _toggleExperimentsEnabled: Task.async(function* (enabled) {
     this._log.trace("_toggleExperimentsEnabled(" + enabled + ")");
     let wasEnabled = gExperimentsEnabled;
-    gExperimentsEnabled = enabled && telemetryEnabled();
+    gExperimentsEnabled = enabled && TelemetryUtils.isTelemetryEnabled;
 
     if (wasEnabled == gExperimentsEnabled) {
       return;

browser/experiments/test/xpcshell/head.js

@@ -233,3 +233,7 @@ function replaceExperiments(experiment, list) {
     },
   });
 }
+
+// Experiments require Telemetry to be enabled, and that's not true for debug
+// builds. Let's just enable it here instead of going through each test.
+Services.prefs.setBoolPref(PREF_TELEMETRY_ENABLED, true);

browser/experiments/test/xpcshell/test_telemetry_disabled.js

@@ -0,0 +1,21 @@
+/* Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/ */
+
+"use strict";
+
+Cu.import("resource:///modules/experiments/Experiments.jsm");
+
+add_test(function test_experiments_activation() {
+  do_get_profile();
+  loadAddonManager();
+
+  Services.prefs.setBoolPref(PREF_EXPERIMENTS_ENABLED, true);
+  Services.prefs.setBoolPref(PREF_TELEMETRY_ENABLED, false);
+
+  let experiments = Experiments.instance();
+  Assert.ok(!experiments.enabled, "Experiments must be disabled if Telemetry is disabled.");
+
+  // TODO: Test that Experiments are turned back on when bug 1232648 lands.
+
+  run_next_test();
+});

browser/experiments/test/xpcshell/xpcshell.ini

@@ -24,6 +24,7 @@ generated-files =
 [test_disableExperiments.js]
 [test_fetch.js]
 [test_telemetry.js]
+[test_telemetry_disabled.js]
 [test_healthreport.js]
 [test_previous_provider.js]
 [test_upgrade.js]

browser/locales/Makefile.in

@@ -72,7 +72,7 @@ SEARCHPLUGINS_NAMES = $(shell cat $(call MERGE_FILE,/searchplugins/list.txt)) dd
 SEARCHPLUGINS_FILENAMES = $(subst :hidden,,$(SEARCHPLUGINS_NAMES))
 SEARCHPLUGINS_PATH := .deps/generated_$(AB_CD)
 SEARCHPLUGINS_TARGET := libs searchplugins
-SEARCHPLUGINS := $(foreach plugin,$(addsuffix .xml,$(SEARCHPLUGINS_FILENAMES)),$(or $(wildcard $(call EN_US_OR_L10N_FILE,searchplugins/$(plugin))),$(info Missing searchplugin: $(plugin))))
+SEARCHPLUGINS := $(foreach plugin,$(addsuffix .xml,$(SEARCHPLUGINS_FILENAMES)),$(or $(wildcard $(call EN_US_OR_L10N_FILE,searchplugins/$(plugin))),$(warning Missing searchplugin: $(plugin))))
 # Some locale-specific search plugins may have preprocessor directives, but the
 # default en-US ones do not.
 SEARCHPLUGINS_FLAGS := --silence-missing-directive-warnings

browser/themes/windows/pageInfo.css

@@ -123,7 +123,7 @@ groupbox.collapsable caption .caption-icon {
   background-position: center;
   -moz-margin-start: 2px;
   -moz-margin-end: 2px;
-  background-image: url("chrome://global/skin/tree/twisty-open.png");
+  background-image: url("chrome://global/skin/tree/twisty.svg#open");
 }
 
 groupbox.collapsable[closed="true"] {
@@ -133,7 +133,7 @@ groupbox.collapsable[closed="true"] {
 }
 
 groupbox.collapsable[closed="true"] caption .caption-icon {
-  background-image: url("chrome://global/skin/tree/twisty-clsd.png");
+  background-image: url("chrome://global/skin/tree/twisty.svg#clsd");
 }
 
 groupbox tree {

build/autoconf/rust.m4

@@ -25,10 +25,10 @@ AC_DEFUN([MOZ_RUST_SUPPORT], [
   fi
   if test -n "$MOZ_RUST" && test -z "$_RUSTC_MAJOR_VERSION" -o \
     "$_RUSTC_MAJOR_VERSION" -lt 1 -o \
-    \( "$_RUSTC_MAJOR_VERSION" -eq 1 -a "$_RUSTC_MINOR_VERSION" -lt 4 \); then
+    \( "$_RUSTC_MAJOR_VERSION" -eq 1 -a "$_RUSTC_MINOR_VERSION" -lt 5 \); then
     AC_MSG_ERROR([Rust compiler ${RUSTC_VERSION} is too old.
       To compile Rust language sources please install at least
-      version 1.4 of the 'rustc' toolchain and make sure it is
+      version 1.5 of the 'rustc' toolchain and make sure it is
       first in your path.
       You can verify this by typing 'rustc --version'.])
   fi

config/rules.mk

@@ -945,7 +945,7 @@ ifdef MOZ_RUST
 # in the target's LIBS.
 $(RSOBJS):
 	$(REPORT_BUILD)
-	$(RUSTC) $(RUSTFLAGS) --crate-type staticlib -o $(call mk_libname,$<) $(_VPATH_SRCS)
+	$(RUSTC) $(RUSTFLAGS) --crate-type staticlib --emit dep-info=$(MDDEPDIR)/$(call mk_libname,$<).pp,link=$(call mk_libname,$<) $(_VPATH_SRCS)
 endif
 
 $(SOBJS):

configure.in

@@ -6405,14 +6405,6 @@ AC_SUBST(TAR)
 AC_CHECK_PROGS(WGET, wget, "")
 AC_SUBST(WGET)
 
-dnl ========================================================
-dnl Signing
-dnl ========================================================
-
-if test -n "$MOZ_SIGN_CMD"; then
-    AC_DEFINE(MOZ_SIGNING)
-fi
-
 dnl ========================================================
 dnl Maintenance Service
 dnl ========================================================

devtools/client/framework/test/browser_toolbox_theme_registration.js

@@ -2,27 +2,20 @@
 /* Any copyright is dedicated to the Public Domain.
    http://creativecommons.org/publicdomain/zero/1.0/ */
 
+// Test for dynamically registering and unregistering themes
 const CHROME_URL = "chrome://mochitests/content/browser/devtools/client/framework/test/";
 
 var toolbox;
 
-function test()
-{
-  gBrowser.selectedTab = gBrowser.addTab();
-  let target = TargetFactory.forTab(gBrowser.selectedTab);
+add_task(function* themeRegistration() {
+  let tab = yield addTab("data:text/html,test");
+  let target = TargetFactory.forTab(tab);
+  toolbox = yield gDevTools.showToolbox(target);
 
-  gBrowser.selectedBrowser.addEventListener("load", function onLoad(evt) {
-    gBrowser.selectedBrowser.removeEventListener(evt.type, onLoad, true);
-    gDevTools.showToolbox(target).then(testRegister);
-  }, true);
-
-  content.location = "data:text/html,test for dynamically registering and unregistering themes";
-}
-
-function testRegister(aToolbox)
-{
-  toolbox = aToolbox
-  gDevTools.once("theme-registered", themeRegistered);
+  let themeId = yield new Promise(resolve => {
+    gDevTools.once("theme-registered", (e, themeId) => {
+      resolve(themeId);
+    });
 
     gDevTools.registerTheme({
       id: "test-theme",
@@ -30,32 +23,24 @@ function testRegister(aToolbox)
       stylesheets: [CHROME_URL + "doc_theme.css"],
       classList: ["theme-test"],
     });
-}
+  });
 
-function themeRegistered(event, themeId)
-{
   is(themeId, "test-theme", "theme-registered event handler sent theme id");
 
   ok(gDevTools.getThemeDefinitionMap().has(themeId), "theme added to map");
+});
+
+add_task(function* themeInOptionsPanel() {
+
+  yield toolbox.selectTool("options");
 
-  // Test that new theme appears in the Options panel
-  let target = TargetFactory.forTab(gBrowser.selectedTab);
-  gDevTools.showToolbox(target, "options").then(() => {
   let panel = toolbox.getCurrentPanel();
-    let doc = panel.panelWin.frameElement.contentDocument;
+  let panelWin = toolbox.getCurrentPanel().panelWin;
+  let doc = panelWin.frameElement.contentDocument;
   let themeOption = doc.querySelector("#devtools-theme-box > radio[value=test-theme]");
 
   ok(themeOption, "new theme exists in the Options panel");
 
-    // Apply the new theme.
-    applyTheme();
-  });
-}
-
-function applyTheme()
-{
-  let panelWin = toolbox.getCurrentPanel().panelWin;
-  let doc = panelWin.frameElement.contentDocument;
   let testThemeOption = doc.querySelector("#devtools-theme-box > radio[value=test-theme]");
   let lightThemeOption = doc.querySelector("#devtools-theme-box > radio[value=light]");
 
@@ -65,24 +50,26 @@ function applyTheme()
   // Select test theme.
   testThemeOption.click();
 
+  info("Waiting for theme to finish loading");
+  yield once(panelWin, "theme-switch-complete");
+
   color = panelWin.getComputedStyle(testThemeOption).color;
   is(color, "rgb(255, 0, 0)", "style applied");
 
   // Select light theme
   lightThemeOption.click();
 
+  info("Waiting for theme to finish loading");
+  yield once(panelWin, "theme-switch-complete");
+
   color = panelWin.getComputedStyle(testThemeOption).color;
   isnot(color, "rgb(255, 0, 0)", "style unapplied");
 
   // Select test theme again.
   testThemeOption.click();
+});
 
-  // Then unregister the test theme.
-  testUnregister();
-}
-
-function testUnregister()
-{
+add_task(function* themeUnregistration() {
   gDevTools.unregisterTheme("test-theme");
 
   ok(!gDevTools.getThemeDefinitionMap().has("test-theme"), "theme removed from map");
@@ -94,20 +81,9 @@ function testUnregister()
   // The default light theme must be selected now.
   is(themeBox.selectedItem, themeBox.querySelector("[value=light]"),
     "theme light must be selected");
-
-  // Make sure the tab-attaching process is done before we destroy the toolbox.
-  let target = TargetFactory.forTab(gBrowser.selectedTab);
-  let actor = target.activeTab.actor;
-  target.client.attachTab(actor, (response) => {
-    cleanup();
 });
-}
 
-function cleanup()
-{
-  toolbox.destroy().then(function() {
+add_task(function* cleanup() {
+  yield toolbox.destroy();
   toolbox = null;
-    gBrowser.removeCurrentTab();
-    finish();
 });
-}

devtools/client/jar.mn

@@ -39,24 +39,24 @@ devtools.jar:
     content/animationinspector/animation-controller.js (animationinspector/animation-controller.js)
     content/animationinspector/animation-panel.js (animationinspector/animation-panel.js)
     content/animationinspector/animation-inspector.xhtml (animationinspector/animation-inspector.xhtml)
-    content/sourceeditor/codemirror/comment/comment.js (sourceeditor/codemirror/addon/comment/comment.js)
-    content/sourceeditor/codemirror/edit/trailingspace.js (sourceeditor/codemirror/addon/edit/trailingspace.js)
-    content/sourceeditor/codemirror/edit/matchbrackets.js (sourceeditor/codemirror/addon/edit/matchbrackets.js)
-    content/sourceeditor/codemirror/edit/closebrackets.js (sourceeditor/codemirror/addon/edit/closebrackets.js)
-    content/sourceeditor/codemirror/dialog/dialog.js (sourceeditor/codemirror/addon/dialog/dialog.js)
-    content/sourceeditor/codemirror/dialog/dialog.css (sourceeditor/codemirror/addon/dialog/dialog.css)
-    content/sourceeditor/codemirror/fold/foldcode.js (sourceeditor/codemirror/addon/fold/foldcode.js)
-    content/sourceeditor/codemirror/fold/brace-fold.js (sourceeditor/codemirror/addon/fold/brace-fold.js)
-    content/sourceeditor/codemirror/fold/comment-fold.js (sourceeditor/codemirror/addon/fold/comment-fold.js)
-    content/sourceeditor/codemirror/fold/xml-fold.js (sourceeditor/codemirror/addon/fold/xml-fold.js)
-    content/sourceeditor/codemirror/fold/foldgutter.js (sourceeditor/codemirror/addon/fold/foldgutter.js)
-    content/sourceeditor/codemirror/hint/show-hint.js (sourceeditor/codemirror/addon/hint/show-hint.js)
-    content/sourceeditor/codemirror/search/search.js (sourceeditor/codemirror/addon/search/search.js)
-    content/sourceeditor/codemirror/search/searchcursor.js (sourceeditor/codemirror/addon/search/searchcursor.js)
-    content/sourceeditor/codemirror/selection/active-line.js (sourceeditor/codemirror/addon/selection/active-line.js)
-    content/sourceeditor/codemirror/tern/tern.js (sourceeditor/codemirror/addon/tern/tern.js)
-    content/sourceeditor/codemirror/codemirror.js (sourceeditor/codemirror/lib/codemirror.js)
-    content/sourceeditor/codemirror/codemirror.css (sourceeditor/codemirror/lib/codemirror.css)
+    content/sourceeditor/codemirror/addon/comment/comment.js (sourceeditor/codemirror/addon/comment/comment.js)
+    content/sourceeditor/codemirror/addon/edit/trailingspace.js (sourceeditor/codemirror/addon/edit/trailingspace.js)
+    content/sourceeditor/codemirror/addon/edit/matchbrackets.js (sourceeditor/codemirror/addon/edit/matchbrackets.js)
+    content/sourceeditor/codemirror/addon/edit/closebrackets.js (sourceeditor/codemirror/addon/edit/closebrackets.js)
+    content/sourceeditor/codemirror/addon/dialog/dialog.js (sourceeditor/codemirror/addon/dialog/dialog.js)
+    content/sourceeditor/codemirror/addon/dialog/dialog.css (sourceeditor/codemirror/addon/dialog/dialog.css)
+    content/sourceeditor/codemirror/addon/fold/foldcode.js (sourceeditor/codemirror/addon/fold/foldcode.js)
+    content/sourceeditor/codemirror/addon/fold/brace-fold.js (sourceeditor/codemirror/addon/fold/brace-fold.js)
+    content/sourceeditor/codemirror/addon/fold/comment-fold.js (sourceeditor/codemirror/addon/fold/comment-fold.js)
+    content/sourceeditor/codemirror/addon/fold/xml-fold.js (sourceeditor/codemirror/addon/fold/xml-fold.js)
+    content/sourceeditor/codemirror/addon/fold/foldgutter.js (sourceeditor/codemirror/addon/fold/foldgutter.js)
+    content/sourceeditor/codemirror/addon/hint/show-hint.js (sourceeditor/codemirror/addon/hint/show-hint.js)
+    content/sourceeditor/codemirror/addon/search/search.js (sourceeditor/codemirror/addon/search/search.js)
+    content/sourceeditor/codemirror/addon/search/searchcursor.js (sourceeditor/codemirror/addon/search/searchcursor.js)
+    content/sourceeditor/codemirror/addon/selection/active-line.js (sourceeditor/codemirror/addon/selection/active-line.js)
+    content/sourceeditor/codemirror/addon/tern/tern.js (sourceeditor/codemirror/addon/tern/tern.js)
+    content/sourceeditor/codemirror/lib/codemirror.js (sourceeditor/codemirror/lib/codemirror.js)
+    content/sourceeditor/codemirror/lib/codemirror.css (sourceeditor/codemirror/lib/codemirror.css)
     content/sourceeditor/codemirror/mode/javascript.js (sourceeditor/codemirror/mode/javascript.js)
     content/sourceeditor/codemirror/mode/xml.js (sourceeditor/codemirror/mode/xml.js)
     content/sourceeditor/codemirror/mode/css.js (sourceeditor/codemirror/mode/css.js)

devtools/client/shared/test/browser_theme_switching.js

@@ -7,7 +7,8 @@ var toolbox;
 add_task(function*() {
   let target = TargetFactory.forTab(gBrowser.selectedTab);
   let toolbox = yield gDevTools.showToolbox(target);
-  let root = toolbox.frame.contentDocument.documentElement;
+  let doc = toolbox.frame.contentDocument;
+  let root = doc.documentElement;
 
   let platform = root.getAttribute("platform");
   let expectedPlatform = getPlatform();
@@ -15,7 +16,24 @@ add_task(function*() {
 
   let theme = Services.prefs.getCharPref("devtools.theme");
   let className = "theme-" + theme;
-  ok(root.classList.contains(className), ":root has " + className + " class (current theme)");
+  ok(root.classList.contains(className),
+     ":root has " + className + " class (current theme)");
+
+  // Convert the xpath result into an array of strings
+  // like `href="{URL}" type="text/css"`
+  let sheetsIterator = doc.evaluate("processing-instruction('xml-stylesheet')",
+                       doc, null, XPathResult.ANY_TYPE, null);
+  let sheetsInDOM = [];
+  let sheet;
+  while (sheet = sheetsIterator.iterateNext()) {
+    sheetsInDOM.push(sheet.data);
+  }
+
+  let sheetsFromTheme = gDevTools.getThemeDefinition(theme).stylesheets;
+  info ("Checking for existence of " + sheetsInDOM.length + " sheets");
+  for (let sheet of sheetsFromTheme) {
+    ok(sheetsInDOM.some(s=>s.includes(sheet)), "There is a stylesheet for " + sheet);
+  }
 
   yield toolbox.destroy();
 });

devtools/client/shared/theme-switching.js

@@ -3,8 +3,9 @@
  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
 
 (function() {
-  const DEVTOOLS_SKIN_URL = "chrome://devtools/skin/";
+  const SCROLLBARS_URL = "chrome://devtools/skin/floating-scrollbars-light.css";
   let documentElement = document.documentElement;
+  let devtoolsStyleSheets = new WeakMap();
 
   function forceStyle() {
     let computedStyle = window.getComputedStyle(documentElement);
@@ -19,6 +20,45 @@
     documentElement.style.display = display; // Restore
   }
 
+  /*
+   * Append a new processing instruction and return an object with
+   *  - styleSheet: DOMNode
+   *  - loadPromise: Promise that resolves once the sheets loads or errors
+   */
+  function appendStyleSheet(url) {
+    let styleSheetAttr = `href="${url}" type="text/css"`;
+    let styleSheet = document.createProcessingInstruction(
+      "xml-stylesheet", styleSheetAttr);
+    let loadPromise = new Promise((resolve, reject) => {
+      function onload() {
+        styleSheet.removeEventListener("load", onload);
+        styleSheet.removeEventListener("error", onerror);
+        resolve();
+      }
+      function onerror() {
+        styleSheet.removeEventListener("load", onload);
+        styleSheet.removeEventListener("error", onerror);
+        reject("Failed to load theme file " + url);
+      }
+
+      styleSheet.addEventListener("load", onload);
+      styleSheet.addEventListener("error", onerror);
+    });
+    document.insertBefore(styleSheet, documentElement);
+    return {styleSheet, loadPromise};
+  }
+
+  /*
+   * Notify the window that a theme switch finished so tests can check the DOM
+   */
+  function notifyWindow() {
+    window.dispatchEvent(new CustomEvent("theme-switch-complete", {}));
+  }
+
+  /*
+   * Apply all the sheets from `newTheme` and remove all of the sheets
+   * from `oldTheme`
+   */
   function switchTheme(newTheme, oldTheme) {
     if (newTheme === oldTheme) {
       return;
@@ -28,8 +68,8 @@
 
     // Unload all theme stylesheets related to the old theme.
     if (oldThemeDef) {
-      for (let url of oldThemeDef.stylesheets) {
-        StylesheetUtils.removeSheet(window, url, "author");
+      for (let sheet of devtoolsStyleSheets.get(oldThemeDef) || []) {
+        sheet.remove();
       }
     }
 
@@ -42,8 +82,17 @@
       newThemeDef = gDevTools.getThemeDefinition("light");
     }
 
+    // Store the sheets in a WeakMap for access later when the theme gets
+    // unapplied.  It's hard to query for processing instructions so this
+    // is an easy way to access them later without storing a property on
+    // the window
+    devtoolsStyleSheets.set(newThemeDef, []);
+
+    let loadEvents = [];
     for (let url of newThemeDef.stylesheets) {
-      StylesheetUtils.loadSheet(window, url, "author");
+      let {styleSheet,loadPromise} = appendStyleSheet(url);
+      devtoolsStyleSheets.get(newThemeDef).push(styleSheet);
+      loadEvents.push(loadPromise);
     }
 
     // Floating scroll-bars like in OSX
@@ -53,21 +102,10 @@
 
     // TODO: extensions might want to customize scrollbar styles too.
     if (!hiddenDOMWindow.matchMedia("(-moz-overlay-scrollbars)").matches) {
-      let scrollbarsUrl = Services.io.newURI(
-        DEVTOOLS_SKIN_URL + "floating-scrollbars-light.css", null, null);
-
       if (newTheme == "dark") {
-        StylesheetUtils.loadSheet(
-          window,
-          scrollbarsUrl,
-          "agent"
-        );
+        StylesheetUtils.loadSheet(window, SCROLLBARS_URL, "agent");
       } else if (oldTheme == "dark") {
-        StylesheetUtils.removeSheet(
-          window,
-          scrollbarsUrl,
-          "agent"
-        );
+        StylesheetUtils.removeSheet(window, SCROLLBARS_URL, "agent");
       }
       forceStyle();
     }
@@ -92,6 +130,8 @@
 
     // Final notification for further theme-switching related logic.
     gDevTools.emit("theme-switched", window, newTheme, oldTheme);
+
+    Promise.all(loadEvents).then(notifyWindow, console.error.bind(console));
   }
 
   function handlePrefChange(event, data) {
@@ -101,7 +141,6 @@
   }
 
   const { classes: Cc, interfaces: Ci, utils: Cu } = Components;
-
   Cu.import("resource://gre/modules/Services.jsm");
   Cu.import("resource://devtools/client/framework/gDevTools.jsm");
   const {require} = Components.utils.import("resource://devtools/shared/Loader.jsm", {});

devtools/client/sourceeditor/autocomplete.js

@@ -8,8 +8,8 @@ const cssAutoCompleter = require("devtools/client/sourceeditor/css-autocompleter
 const { AutocompletePopup } = require("devtools/client/shared/autocomplete-popup");
 
 const CM_TERN_SCRIPTS = [
-  "chrome://devtools/content/sourceeditor/codemirror/tern/tern.js",
-  "chrome://devtools/content/sourceeditor/codemirror/hint/show-hint.js"
+  "chrome://devtools/content/sourceeditor/codemirror/addon/tern/tern.js",
+  "chrome://devtools/content/sourceeditor/codemirror/addon/hint/show-hint.js"
 ];
 
 const autocompleteMap = new WeakMap();

devtools/client/sourceeditor/editor.js

@@ -47,35 +47,35 @@ const { OS } = Services.appinfo;
 
 const CM_STYLES   = [
   "chrome://devtools/skin/common.css",
-  "chrome://devtools/content/sourceeditor/codemirror/codemirror.css",
-  "chrome://devtools/content/sourceeditor/codemirror/dialog/dialog.css",
+  "chrome://devtools/content/sourceeditor/codemirror/lib/codemirror.css",
+  "chrome://devtools/content/sourceeditor/codemirror/addon/dialog/dialog.css",
   "chrome://devtools/content/sourceeditor/codemirror/mozilla.css"
 ];
 
 const CM_SCRIPTS  = [
   "chrome://devtools/content/shared/theme-switching.js",
-  "chrome://devtools/content/sourceeditor/codemirror/codemirror.js",
-  "chrome://devtools/content/sourceeditor/codemirror/dialog/dialog.js",
-  "chrome://devtools/content/sourceeditor/codemirror/search/searchcursor.js",
-  "chrome://devtools/content/sourceeditor/codemirror/search/search.js",
-  "chrome://devtools/content/sourceeditor/codemirror/edit/matchbrackets.js",
-  "chrome://devtools/content/sourceeditor/codemirror/edit/closebrackets.js",
-  "chrome://devtools/content/sourceeditor/codemirror/comment/comment.js",
+  "chrome://devtools/content/sourceeditor/codemirror/lib/codemirror.js",
+  "chrome://devtools/content/sourceeditor/codemirror/addon/dialog/dialog.js",
+  "chrome://devtools/content/sourceeditor/codemirror/addon/search/searchcursor.js",
+  "chrome://devtools/content/sourceeditor/codemirror/addon/search/search.js",
+  "chrome://devtools/content/sourceeditor/codemirror/addon/edit/matchbrackets.js",
+  "chrome://devtools/content/sourceeditor/codemirror/addon/edit/closebrackets.js",
+  "chrome://devtools/content/sourceeditor/codemirror/addon/comment/comment.js",
   "chrome://devtools/content/sourceeditor/codemirror/mode/javascript.js",
   "chrome://devtools/content/sourceeditor/codemirror/mode/xml.js",
   "chrome://devtools/content/sourceeditor/codemirror/mode/css.js",
   "chrome://devtools/content/sourceeditor/codemirror/mode/htmlmixed.js",
   "chrome://devtools/content/sourceeditor/codemirror/mode/clike.js",
-  "chrome://devtools/content/sourceeditor/codemirror/selection/active-line.js",
-  "chrome://devtools/content/sourceeditor/codemirror/edit/trailingspace.js",
+  "chrome://devtools/content/sourceeditor/codemirror/addon/selection/active-line.js",
+  "chrome://devtools/content/sourceeditor/codemirror/addon/edit/trailingspace.js",
   "chrome://devtools/content/sourceeditor/codemirror/keymap/emacs.js",
   "chrome://devtools/content/sourceeditor/codemirror/keymap/vim.js",
   "chrome://devtools/content/sourceeditor/codemirror/keymap/sublime.js",
-  "chrome://devtools/content/sourceeditor/codemirror/fold/foldcode.js",
-  "chrome://devtools/content/sourceeditor/codemirror/fold/brace-fold.js",
-  "chrome://devtools/content/sourceeditor/codemirror/fold/comment-fold.js",
-  "chrome://devtools/content/sourceeditor/codemirror/fold/xml-fold.js",
-  "chrome://devtools/content/sourceeditor/codemirror/fold/foldgutter.js"
+  "chrome://devtools/content/sourceeditor/codemirror/addon/fold/foldcode.js",
+  "chrome://devtools/content/sourceeditor/codemirror/addon/fold/brace-fold.js",
+  "chrome://devtools/content/sourceeditor/codemirror/addon/fold/comment-fold.js",
+  "chrome://devtools/content/sourceeditor/codemirror/addon/fold/xml-fold.js",
+  "chrome://devtools/content/sourceeditor/codemirror/addon/fold/foldgutter.js"
 ];
 
 const CM_IFRAME   =

devtools/client/sourceeditor/test/codemirror/codemirror.html

@@ -3,15 +3,15 @@
   <head>
     <meta charset="utf-8">
     <title>CodeMirror: Basic Tests</title>
-    <link rel="stylesheet" href="chrome://devtools/content/sourceeditor/codemirror/codemirror.css">
+    <link rel="stylesheet" href="chrome://devtools/content/sourceeditor/codemirror/lib/codemirror.css">
     <link rel="stylesheet" href="cm_mode_test.css">
     <!--<link rel="stylesheet" href="../doc/docs.css">-->
 
-    <script src="chrome://devtools/content/sourceeditor/codemirror/codemirror.js"></script>
-    <script src="chrome://devtools/content/sourceeditor/codemirror/search/searchcursor.js"></script>
-    <script src="chrome://devtools/content/sourceeditor/codemirror/dialog/dialog.js"></script>
-    <script src="chrome://devtools/content/sourceeditor/codemirror/edit/matchbrackets.js"></script>
-    <script src="chrome://devtools/content/sourceeditor/codemirror/comment/comment.js"></script>
+    <script src="chrome://devtools/content/sourceeditor/codemirror/lib/codemirror.js"></script>
+    <script src="chrome://devtools/content/sourceeditor/codemirror/addon/search/searchcursor.js"></script>
+    <script src="chrome://devtools/content/sourceeditor/codemirror/addon/dialog/dialog.js"></script>
+    <script src="chrome://devtools/content/sourceeditor/codemirror/addon/edit/matchbrackets.js"></script>
+    <script src="chrome://devtools/content/sourceeditor/codemirror/addon/comment/comment.js"></script>
     <script src="chrome://devtools/content/sourceeditor/codemirror/mode/javascript.js"></script>
     <script src="chrome://devtools/content/sourceeditor/codemirror/keymap/vim.js"></script>
     <script src="chrome://devtools/content/sourceeditor/codemirror/keymap/emacs.js"></script>

devtools/client/sourceeditor/test/codemirror/vimemacs.html

@@ -3,15 +3,15 @@
   <head>
     <meta charset="utf-8">
     <title>CodeMirror: VIM/Emacs tests</title>
-    <link rel="stylesheet" href="chrome://devtools/content/sourceeditor/codemirror/codemirror.css">
+    <link rel="stylesheet" href="chrome://devtools/content/sourceeditor/codemirror/lib/codemirror.css">
     <link rel="stylesheet" href="cm_mode_test.css">
     <!--<link rel="stylesheet" href="../doc/docs.css">-->
 
-    <script src="chrome://devtools/content/sourceeditor/codemirror/codemirror.js"></script>
-    <script src="chrome://devtools/content/sourceeditor/codemirror/search/searchcursor.js"></script>
-    <script src="chrome://devtools/content/sourceeditor/codemirror/dialog/dialog.js"></script>
-    <script src="chrome://devtools/content/sourceeditor/codemirror/edit/matchbrackets.js"></script>
-    <script src="chrome://devtools/content/sourceeditor/codemirror/comment/comment.js"></script>
+    <script src="chrome://devtools/content/sourceeditor/codemirror/lib/codemirror.js"></script>
+    <script src="chrome://devtools/content/sourceeditor/codemirror/addon/search/searchcursor.js"></script>
+    <script src="chrome://devtools/content/sourceeditor/codemirror/addon/dialog/dialog.js"></script>
+    <script src="chrome://devtools/content/sourceeditor/codemirror/addon/edit/matchbrackets.js"></script>
+    <script src="chrome://devtools/content/sourceeditor/codemirror/addon/comment/comment.js"></script>
     <script src="chrome://devtools/content/sourceeditor/codemirror/mode/javascript.js"></script>
     <script src="chrome://devtools/content/sourceeditor/codemirror/keymap/vim.js"></script>
     <script src="chrome://devtools/content/sourceeditor/codemirror/keymap/sublime.js"></script>

devtools/client/themes/animationinspector.css

@@ -290,7 +290,7 @@ body {
   height: 100%;
   box-sizing: border-box;
 
-  --timelime-border-color: var(--theme-body-color);
+  --timeline-border-color: var(--theme-body-color);
   --timeline-background-color: var(--theme-splitter-color);
 
   /* Iterations of the animation are displayed with a repeating linear-gradient
@@ -299,25 +299,25 @@ body {
      the border of this element */
   background-image:
     linear-gradient(to right,
-                    var(--timelime-border-color) 0,
-                    var(--timelime-border-color) 1px,
+                    var(--timeline-border-color) 0,
+                    var(--timeline-border-color) 1px,
                     transparent 1px,
                     transparent 2px);
   background-repeat: repeat-x;
   background-position: -1px 0;
-  border: 1px solid var(--timelime-border-color);
+  border: 1px solid var(--timeline-border-color);
 
   /* The background color is set independently */
   background-color: var(--timeline-background-color);
 }
 
 .animation-timeline .animation .cssanimation {
-  --timelime-border-color: var(--theme-highlight-lightorange);
+  --timeline-border-color: var(--theme-highlight-lightorange);
   --timeline-background-color: var(--theme-contrast-background);
 }
 
 .animation-timeline .animation .csstransition {
-  --timelime-border-color: var(--theme-highlight-bluegrey);
+  --timeline-border-color: var(--theme-highlight-bluegrey);
   --timeline-background-color: var(--theme-highlight-blue);
 }
 
@@ -369,14 +369,14 @@ body {
   box-sizing: border-box;
   height: calc(100% + 2px);
 
-  border: 1px solid var(--timelime-border-color);
+  border: 1px solid var(--timeline-border-color);
   border-width: 1px 0 1px 1px;
   background-image: repeating-linear-gradient(45deg,
                                               transparent,
                                               transparent 1px,
                                               var(--theme-selection-color) 1px,
                                               var(--theme-selection-color) 4px);
-  background-color: var(--timelime-border-color);
+  background-color: var(--timeline-border-color);
 }
 
 .animation-timeline .animation .delay.negative {

devtools/client/themes/layoutview.css

@@ -6,7 +6,7 @@
   box-sizing: border-box;
 }
 
-.theme-sidebar body {
+body.theme-sidebar {
   /* The view will grow bigger as the window gets resized, until 400px */
   max-width: 400px;
   margin: 0px auto;

devtools/shared/heapsnapshot/DominatorTree.cpp

@@ -4,25 +4,11 @@
  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
 
 #include "mozilla/devtools/DominatorTree.h"
-#include "js/Debug.h"
-#include "mozilla/CycleCollectedJSRuntime.h"
 #include "mozilla/dom/DominatorTreeBinding.h"
 
 namespace mozilla {
 namespace devtools {
 
-static MallocSizeOf
-getCurrentThreadDebuggerMallocSizeOf()
-{
-  auto ccrt = CycleCollectedJSRuntime::Get();
-  MOZ_ASSERT(ccrt);
-  auto rt = ccrt->Runtime();
-  MOZ_ASSERT(rt);
-  auto mallocSizeOf = JS::dbg::GetDebuggerMallocSizeOf(rt);
-  MOZ_ASSERT(mallocSizeOf);
-  return mallocSizeOf;
-}
-
 dom::Nullable<uint64_t>
 DominatorTree::GetRetainedSize(uint64_t aNodeId, ErrorResult& aRv)
 {
@@ -31,7 +17,7 @@ DominatorTree::GetRetainedSize(uint64_t aNodeId, ErrorResult& aRv)
   if (node.isNothing())
     return dom::Nullable<uint64_t>();
 
-  auto mallocSizeOf = getCurrentThreadDebuggerMallocSizeOf();
+  auto mallocSizeOf = GetCurrentThreadDebuggerMallocSizeOf();
   JS::ubi::Node::Size size = 0;
   if (!mDominatorTree.getRetainedSize(*node, mallocSizeOf, size)) {
     aRv.Throw(NS_ERROR_OUT_OF_MEMORY);
@@ -83,7 +69,7 @@ DominatorTree::GetImmediatelyDominated(uint64_t aNodeId,
     return;
 
   // Get all immediately dominated nodes and their retained sizes.
-  MallocSizeOf mallocSizeOf = getCurrentThreadDebuggerMallocSizeOf();
+  MallocSizeOf mallocSizeOf = GetCurrentThreadDebuggerMallocSizeOf();
   Maybe<JS::ubi::DominatorTree::DominatedSetRange> range = mDominatorTree.getDominatedSet(*node);
   MOZ_ASSERT(range.isSome(), "The node should be known, since we got it from the heap snapshot.");
   size_t length = range->length();

devtools/shared/heapsnapshot/HeapSnapshot.cpp

@@ -55,6 +55,18 @@ using ::google::protobuf::io::ZeroCopyInputStream;
 
 using JS::ubi::AtomOrTwoByteChars;
 
+MallocSizeOf
+GetCurrentThreadDebuggerMallocSizeOf()
+{
+  auto ccrt = CycleCollectedJSRuntime::Get();
+  MOZ_ASSERT(ccrt);
+  auto rt = ccrt->Runtime();
+  MOZ_ASSERT(rt);
+  auto mallocSizeOf = JS::dbg::GetDebuggerMallocSizeOf(rt);
+  MOZ_ASSERT(mallocSizeOf);
+  return mallocSizeOf;
+}
+
 /*** Cycle Collection Boilerplate *****************************************************************/
 
 NS_IMPL_CYCLE_COLLECTION_WRAPPERCACHE(HeapSnapshot, mParent)
@@ -482,7 +494,7 @@ HeapSnapshot::TakeCensus(JSContext* cx, JS::HandleObject options,
     return;
   }
 
-  JS::ubi::CensusHandler handler(census, rootCount);
+  JS::ubi::CensusHandler handler(census, rootCount, GetCurrentThreadDebuggerMallocSizeOf());
 
   {
     JS::AutoCheckCannotGC nogc;
@@ -504,7 +516,7 @@ HeapSnapshot::TakeCensus(JSContext* cx, JS::HandleObject options,
     }
   }
 
-  if (NS_WARN_IF(!handler.report(rval))) {
+  if (NS_WARN_IF(!handler.report(cx, rval))) {
     rv.Throw(NS_ERROR_OUT_OF_MEMORY);
     return;
   }

devtools/shared/heapsnapshot/HeapSnapshot.h

@@ -221,6 +221,9 @@ WriteHeapGraph(JSContext* cx,
                         ignoreNodeCount, ignoreEdgeCount);
 }
 
+// Get the mozilla::MallocSizeOf for the current thread's JSRuntime.
+MallocSizeOf GetCurrentThreadDebuggerMallocSizeOf();
+
 } // namespace devtools
 } // namespace mozilla
 

dom/base/FileReader.cpp

@@ -6,34 +6,34 @@
 
 #include "FileReader.h"
 
-#include "nsContentCID.h"
-#include "nsContentUtils.h"
-#include "nsDOMClassInfoID.h"
-#include "nsError.h"
-#include "nsIFile.h"
-#include "nsNetCID.h"
-#include "nsNetUtil.h"
+#include "nsIEventTarget.h"
+#include "nsIGlobalObject.h"
+#include "nsITimer.h"
+#include "nsITransport.h"
+#include "nsIStreamTransportService.h"
 
-#include "nsXPCOM.h"
-#include "nsIDOMEventListener.h"
-#include "nsJSEnvironment.h"
-#include "nsCycleCollectionParticipant.h"
 #include "mozilla/Base64.h"
+#include "mozilla/dom/DOMError.h"
 #include "mozilla/dom/EncodingUtils.h"
 #include "mozilla/dom/File.h"
 #include "mozilla/dom/FileReaderBinding.h"
 #include "mozilla/dom/ProgressEvent.h"
-#include "xpcpublic.h"
+#include "nsContentUtils.h"
+#include "nsCycleCollectionParticipant.h"
 #include "nsDOMJSUtils.h"
+#include "nsError.h"
+#include "nsNetCID.h"
+#include "nsNetUtil.h"
+#include "xpcpublic.h"
 
-#include "jsfriendapi.h"
-
-#include "nsITransport.h"
-#include "nsIStreamTransportService.h"
+#include "WorkerPrivate.h"
+#include "WorkerScope.h"
 
 namespace mozilla {
 namespace dom {
 
+using namespace workers;
+
 #define ABORT_STR "abort"
 #define LOAD_STR "load"
 #define LOADSTART_STR "loadstart"
@@ -56,7 +56,7 @@ NS_IMPL_CYCLE_COLLECTION_TRAVERSE_END
 
 NS_IMPL_CYCLE_COLLECTION_UNLINK_BEGIN_INHERITED(FileReader,
                                                 DOMEventTargetHelper)
-  tmp->mResultArrayBuffer = nullptr;
+  tmp->Shutdown();
   NS_IMPL_CYCLE_COLLECTION_UNLINK(mBlob)
   NS_IMPL_CYCLE_COLLECTION_UNLINK(mProgressNotifier)
   NS_IMPL_CYCLE_COLLECTION_UNLINK(mError)
@@ -76,6 +76,20 @@ NS_INTERFACE_MAP_END_INHERITING(DOMEventTargetHelper)
 NS_IMPL_ADDREF_INHERITED(FileReader, DOMEventTargetHelper)
 NS_IMPL_RELEASE_INHERITED(FileReader, DOMEventTargetHelper)
 
+class MOZ_RAII FileReaderDecreaseBusyCounter
+{
+  RefPtr<FileReader> mFileReader;
+public:
+  explicit FileReaderDecreaseBusyCounter(FileReader* aFileReader)
+    : mFileReader(aFileReader)
+  {}
+
+  ~FileReaderDecreaseBusyCounter()
+  {
+    mFileReader->DecreaseBusyCounter();
+  }
+};
+
 void
 FileReader::RootResultArrayBuffer()
 {
@@ -84,7 +98,8 @@ FileReader::RootResultArrayBuffer()
 
 //FileReader constructors/initializers
 
-FileReader::FileReader(nsPIDOMWindow* aWindow)
+FileReader::FileReader(nsPIDOMWindow* aWindow,
+                       WorkerPrivate* aWorkerPrivate)
   : DOMEventTargetHelper(aWindow)
   , mFileData(nullptr)
   , mDataLen(0)
@@ -95,14 +110,18 @@ FileReader::FileReader(nsPIDOMWindow* aWindow)
   , mReadyState(EMPTY)
   , mTotal(0)
   , mTransferred(0)
+  , mTarget(do_GetCurrentThread())
+  , mBusyCount(0)
+  , mWorkerPrivate(aWorkerPrivate)
 {
+  MOZ_ASSERT_IF(!NS_IsMainThread(), mWorkerPrivate && !aWindow);
+  MOZ_ASSERT_IF(NS_IsMainThread(), !mWorkerPrivate);
   SetDOMStringToNull(mResult);
 }
 
 FileReader::~FileReader()
 {
-  FreeFileData();
-  mResultArrayBuffer = nullptr;
+  Shutdown();
   DropJSObjects(this);
 }
 
@@ -111,9 +130,17 @@ FileReader::Constructor(const GlobalObject& aGlobal, ErrorResult& aRv)
 {
   // The owner can be null when this object is used by chrome code.
   nsCOMPtr<nsPIDOMWindow> owner = do_QueryInterface(aGlobal.GetAsSupports());
-  RefPtr<FileReader> fileReader = new FileReader(owner);
+  WorkerPrivate* workerPrivate = nullptr;
 
-  if (!owner && nsContentUtils::IsCallerChrome()) {
+  if (!NS_IsMainThread()) {
+    JSContext* cx = aGlobal.Context();
+    workerPrivate = GetWorkerPrivateFromContext(cx);
+    MOZ_ASSERT(workerPrivate);
+  }
+
+  RefPtr<FileReader> fileReader = new FileReader(owner, workerPrivate);
+
+  if (!owner && nsContentUtils::ThreadsafeIsCallerChrome()) {
     // Instead of grabbing some random global from the context stack,
     // let's use the default one (junk scope) for now.
     // We should move away from this Init...
@@ -215,7 +242,17 @@ FileReader::DoOnLoadEnd(nsresult aStatus,
   switch (mDataFormat) {
     case FILE_AS_ARRAYBUFFER: {
       AutoJSAPI jsapi;
-      if (NS_WARN_IF(!jsapi.Init(DOMEventTargetHelper::GetParentObject()))) {
+      nsCOMPtr<nsIGlobalObject> globalObject;
+
+      if (NS_IsMainThread()) {
+        globalObject = do_QueryInterface(GetParentObject());
+      } else {
+        MOZ_ASSERT(mWorkerPrivate);
+        MOZ_ASSERT(mBusyCount);
+        globalObject = mWorkerPrivate->GlobalScope();
+      }
+
+      if (!globalObject || !jsapi.Init(globalObject)) {
         FreeFileData();
         return NS_ERROR_FAILURE;
       }
@@ -256,9 +293,29 @@ FileReader::DoOnLoadEnd(nsresult aStatus,
 }
 
 nsresult
-FileReader::DoReadData(nsIAsyncInputStream* aStream, uint64_t aCount)
+FileReader::DoAsyncWait()
 {
-  MOZ_ASSERT(aStream);
+  nsresult rv = IncreaseBusyCounter();
+  if (NS_WARN_IF(NS_FAILED(rv))) {
+    return rv;
+  }
+
+  rv = mAsyncStream->AsyncWait(this,
+                               /* aFlags*/ 0,
+                               /* aRequestedCount */ 0,
+                               mTarget);
+  if (NS_WARN_IF(NS_FAILED(rv))) {
+    DecreaseBusyCounter();
+    return rv;
+  }
+
+  return NS_OK;
+}
+
+nsresult
+FileReader::DoReadData(uint64_t aCount)
+{
+  MOZ_ASSERT(mAsyncStream);
 
   if (mDataFormat == FILE_AS_BINARY) {
     //Continuously update our binary string as data comes in
@@ -271,7 +328,7 @@ FileReader::DoReadData(nsIAsyncInputStream* aStream, uint64_t aCount)
     NS_ENSURE_TRUE(buf, NS_ERROR_OUT_OF_MEMORY);
 
     uint32_t bytesRead = 0;
-    aStream->ReadSegments(ReadFuncBinaryString, buf + oldLen, aCount,
+    mAsyncStream->ReadSegments(ReadFuncBinaryString, buf + oldLen, aCount,
                                &bytesRead);
     NS_ASSERTION(bytesRead == aCount, "failed to read data");
   }
@@ -287,7 +344,7 @@ FileReader::DoReadData(nsIAsyncInputStream* aStream, uint64_t aCount)
     }
 
     uint32_t bytesRead = 0;
-    aStream->Read(mFileData + mDataLen, aCount, &bytesRead);
+    mAsyncStream->Read(mFileData + mDataLen, aCount, &bytesRead);
     NS_ASSERTION(bytesRead == aCount, "failed to read data");
   }
 
@@ -361,10 +418,7 @@ FileReader::ReadFileContent(Blob& aBlob,
     return;
   }
 
-  aRv = mAsyncStream->AsyncWait(this,
-                                /* aFlags*/ 0,
-                                /* aRequestedCount */ 0,
-                                NS_GetCurrentThread());
+  aRv = DoAsyncWait();
   if (NS_WARN_IF(aRv.Failed())) {
     return;
   }
@@ -467,6 +521,7 @@ FileReader::StartProgressEventTimer()
     mProgressEventWasDelayed = false;
     mTimerIsActive = true;
     mProgressNotifier->Cancel();
+    mProgressNotifier->SetTarget(mTarget);
     mProgressNotifier->InitWithCallback(this, NS_PROGRESS_EVENT_INTERVAL,
                                         nsITimer::TYPE_ONE_SHOT);
   }
@@ -550,18 +605,20 @@ FileReader::OnInputStreamReady(nsIAsyncInputStream* aStream)
     return NS_OK;
   }
 
+  // We use this class to decrease the busy counter at the end of this method.
+  // In theory we can do it immediatelly but, for debugging reasons, we want to
+  // be 100% sure we have a feature when OnLoadEnd() is called.
+  FileReaderDecreaseBusyCounter RAII(this);
+
   uint64_t aCount;
   nsresult rv = aStream->Available(&aCount);
 
   if (NS_SUCCEEDED(rv) && aCount) {
-    rv = DoReadData(aStream, aCount);
+    rv = DoReadData(aCount);
   }
 
   if (NS_SUCCEEDED(rv)) {
-    rv = aStream->AsyncWait(this,
-                            /* aFlags*/ 0,
-                            /* aRequestedCount */ 0,
-                            NS_GetCurrentThread());
+    rv = DoAsyncWait();
   }
 
   if (NS_FAILED(rv) || !aCount) {
@@ -643,5 +700,56 @@ FileReader::Abort(ErrorResult& aRv)
   DispatchProgressEvent(NS_LITERAL_STRING(LOADEND_STR));
 }
 
+nsresult
+FileReader::IncreaseBusyCounter()
+{
+  if (mWorkerPrivate && mBusyCount++ == 0 &&
+      !mWorkerPrivate->AddFeature(mWorkerPrivate->GetJSContext(), this)) {
+    return NS_ERROR_FAILURE;
+  }
+
+  return NS_OK;
+}
+
+void
+FileReader::DecreaseBusyCounter()
+{
+  MOZ_ASSERT_IF(mWorkerPrivate, mBusyCount);
+  if (mWorkerPrivate && --mBusyCount == 0) {
+    mWorkerPrivate->RemoveFeature(mWorkerPrivate->GetJSContext(), this);
+  }
+}
+
+bool
+FileReader::Notify(JSContext* aCx, Status aStatus)
+{
+  MOZ_ASSERT(mWorkerPrivate);
+  mWorkerPrivate->AssertIsOnWorkerThread();
+
+  if (aStatus > Running) {
+    Shutdown();
+  }
+
+  return true;
+}
+
+void
+FileReader::Shutdown()
+{
+  FreeFileData();
+  mResultArrayBuffer = nullptr;
+
+  if (mAsyncStream) {
+    mAsyncStream->Close();
+    mAsyncStream = nullptr;
+  }
+
+  if (mWorkerPrivate && mBusyCount != 0) {
+    mWorkerPrivate->RemoveFeature(mWorkerPrivate->GetJSContext(), this);
+    mWorkerPrivate = nullptr;
+    mBusyCount = 0;
+  }
+}
+
 } // dom namespace
 } // mozilla namespace

dom/base/FileReader.h

@@ -9,37 +9,45 @@
 
 #include "mozilla/Attributes.h"
 #include "mozilla/DOMEventTargetHelper.h"
-#include "mozilla/dom/DOMError.h"
 
-#include "nsCOMPtr.h"
 #include "nsIAsyncInputStream.h"
-#include "nsIStreamListener.h"
-#include "nsISupportsUtils.h"
 #include "nsIInterfaceRequestor.h"
-#include "nsITimer.h"
-#include "nsJSUtils.h"
+#include "nsCOMPtr.h"
 #include "nsString.h"
-#include "nsTArray.h"
 #include "nsWeakReference.h"
-#include "prtime.h"
+#include "WorkerFeature.h"
 
 #define NS_PROGRESS_EVENT_INTERVAL 50
 
+class nsITimer;
+class nsIEventTarget;
+
 namespace mozilla {
 namespace dom {
 
 class Blob;
+class DOMError;
+
+namespace workers {
+class WorkerPrivate;
+}
 
 extern const uint64_t kUnknownSize;
 
+class FileReaderDecreaseBusyCounter;
+
 class FileReader final : public DOMEventTargetHelper,
                          public nsIInterfaceRequestor,
                          public nsSupportsWeakReference,
                          public nsIInputStreamCallback,
-                         public nsITimerCallback
+                         public nsITimerCallback,
+                         public workers::WorkerFeature
 {
+  friend class FileReaderDecreaseBusyCounter;
+
 public:
-  explicit FileReader(nsPIDOMWindow* aWindow);
+  FileReader(nsPIDOMWindow* aWindow,
+             workers::WorkerPrivate* aWorkerPrivate);
 
   NS_DECL_ISUPPORTS_INHERITED
 
@@ -47,9 +55,11 @@ public:
   NS_DECL_NSIINPUTSTREAMCALLBACK
   NS_DECL_NSIINTERFACEREQUESTOR
 
-  NS_DECL_CYCLE_COLLECTION_SCRIPT_HOLDER_CLASS_INHERITED(FileReader, DOMEventTargetHelper)
+  NS_DECL_CYCLE_COLLECTION_SCRIPT_HOLDER_CLASS_INHERITED(FileReader,
+                                                         DOMEventTargetHelper)
 
-  virtual JSObject* WrapObject(JSContext* aCx, JS::Handle<JSObject*> aGivenProto) override;
+  virtual JSObject* WrapObject(JSContext* aCx,
+                               JS::Handle<JSObject*> aGivenProto) override;
 
   // WebIDL
   static already_AddRefed<FileReader>
@@ -96,6 +106,9 @@ public:
     ReadFileContent(aBlob, EmptyString(), FILE_AS_BINARY, aRv);
   }
 
+  // WorkerFeature
+  bool Notify(JSContext* aCx, workers::Status) override;
+
 private:
   virtual ~FileReader();
 
@@ -131,7 +144,8 @@ private:
   void DispatchError(nsresult rv, nsAString& finalEvent);
   nsresult DispatchProgressEvent(const nsAString& aType);
 
-  nsresult DoReadData(nsIAsyncInputStream* aStream, uint64_t aCount);
+  nsresult DoAsyncWait();
+  nsresult DoReadData(uint64_t aCount);
 
   nsresult DoOnLoadEnd(nsresult aStatus, nsAString& aSuccessEvent,
                        nsAString& aTerminationEvent);
@@ -143,6 +157,11 @@ private:
     mDataLen = 0;
   }
 
+  nsresult IncreaseBusyCounter();
+  void DecreaseBusyCounter();
+
+  void Shutdown();
+
   char *mFileData;
   RefPtr<Blob> mBlob;
   nsCString mCharset;
@@ -166,6 +185,13 @@ private:
 
   uint64_t mTotal;
   uint64_t mTransferred;
+
+  nsCOMPtr<nsIEventTarget> mTarget;
+
+  uint64_t mBusyCount;
+
+  // Kept alive with a WorkerFeature.
+  workers::WorkerPrivate* mWorkerPrivate;
 };
 
 } // dom namespace

dom/base/ImageEncoder.cpp

@@ -5,6 +5,7 @@
  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
 
 #include "ImageEncoder.h"
+#include "mozilla/ClearOnShutdown.h"
 #include "mozilla/dom/CanvasRenderingContext2D.h"
 #include "mozilla/gfx/2D.h"
 #include "mozilla/gfx/DataSurfaceHelpers.h"
@@ -13,7 +14,10 @@
 #include "mozilla/SyncRunnable.h"
 #include "mozilla/unused.h"
 #include "gfxUtils.h"
+#include "nsIThreadPool.h"
 #include "nsNetUtil.h"
+#include "nsXPCOMCIDInternal.h"
+#include "WorkerPrivate.h"
 
 using namespace mozilla::gfx;
 
@@ -69,27 +73,28 @@ GetBRGADataSourceSurfaceSync(already_AddRefed<layers::Image> aImage)
   return helper->GetDataSurfaceSafe();
 }
 
-class EncodingCompleteEvent : public nsRunnable
+class EncodingCompleteEvent : public nsCancelableRunnable
 {
   virtual ~EncodingCompleteEvent() {}
 
 public:
-  NS_DECL_ISUPPORTS_INHERITED
-
-  EncodingCompleteEvent(nsIThread* aEncoderThread,
-                        EncodeCompleteCallback* aEncodeCompleteCallback)
+  explicit EncodingCompleteEvent(EncodeCompleteCallback* aEncodeCompleteCallback)
     : mImgSize(0)
     , mType()
     , mImgData(nullptr)
-    , mEncoderThread(aEncoderThread)
     , mEncodeCompleteCallback(aEncodeCompleteCallback)
     , mFailed(false)
-  {}
+  {
+    if (!NS_IsMainThread() && workers::GetCurrentThreadWorkerPrivate()) {
+      mCreationThread = NS_GetCurrentThread();
+    } else {
+      NS_GetMainThread(getter_AddRefs(mCreationThread));
+    }
+  }
 
   NS_IMETHOD Run() override
   {
     nsresult rv = NS_OK;
-    MOZ_ASSERT(NS_IsMainThread());
 
     if (!mFailed) {
       // The correct parentObject has to be set by the mEncodeCompleteCallback.
@@ -102,7 +107,6 @@ public:
 
     mEncodeCompleteCallback = nullptr;
 
-    mEncoderThread->Shutdown();
     return rv;
   }
 
@@ -118,17 +122,20 @@ public:
     mFailed = true;
   }
 
+  nsIThread* GetCreationThread()
+  {
+    return mCreationThread;
+  }
+
 private:
   uint64_t mImgSize;
   nsAutoString mType;
   void* mImgData;
-  nsCOMPtr<nsIThread> mEncoderThread;
+  nsCOMPtr<nsIThread> mCreationThread;
   RefPtr<EncodeCompleteCallback> mEncodeCompleteCallback;
   bool mFailed;
 };
 
-NS_IMPL_ISUPPORTS_INHERITED0(EncodingCompleteEvent, nsRunnable);
-
 class EncodingRunnable : public nsRunnable
 {
   virtual ~EncodingRunnable() {}
@@ -207,7 +214,8 @@ public:
     } else {
       mEncodingCompleteEvent->SetMembers(imgData, imgSize, mType);
     }
-    rv = NS_DispatchToMainThread(mEncodingCompleteEvent);
+    rv = mEncodingCompleteEvent->GetCreationThread()->
+      Dispatch(mEncodingCompleteEvent, nsIThread::DISPATCH_NORMAL);
     if (NS_FAILED(rv)) {
       // Better to leak than to crash.
       Unused << mEncodingCompleteEvent.forget();
@@ -231,6 +239,8 @@ private:
 
 NS_IMPL_ISUPPORTS_INHERITED0(EncodingRunnable, nsRunnable);
 
+StaticRefPtr<nsIThreadPool> ImageEncoder::sThreadPool;
+
 /* static */
 nsresult
 ImageEncoder::ExtractData(nsAString& aType,
@@ -262,12 +272,13 @@ ImageEncoder::ExtractDataFromLayersImageAsync(nsAString& aType,
     return NS_IMAGELIB_ERROR_NO_ENCODER;
   }
 
-  nsCOMPtr<nsIThread> encoderThread;
-  nsresult rv = NS_NewThread(getter_AddRefs(encoderThread), nullptr);
-  NS_ENSURE_SUCCESS(rv, rv);
+  nsresult rv = EnsureThreadPool();
+  if (NS_FAILED(rv)) {
+    return rv;
+  }
 
   RefPtr<EncodingCompleteEvent> completeEvent =
-    new EncodingCompleteEvent(encoderThread, aEncodeCallback);
+    new EncodingCompleteEvent(aEncodeCallback);
 
   nsIntSize size(aImage->GetSize().width, aImage->GetSize().height);
   nsCOMPtr<nsIRunnable> event = new EncodingRunnable(aType,
@@ -279,7 +290,7 @@ ImageEncoder::ExtractDataFromLayersImageAsync(nsAString& aType,
                                                      imgIEncoder::INPUT_FORMAT_HOSTARGB,
                                                      size,
                                                      aUsingCustomOptions);
-  return encoderThread->Dispatch(event, NS_DISPATCH_NORMAL);
+  return sThreadPool->Dispatch(event, NS_DISPATCH_NORMAL);
 }
 
 /* static */
@@ -297,12 +308,13 @@ ImageEncoder::ExtractDataAsync(nsAString& aType,
     return NS_IMAGELIB_ERROR_NO_ENCODER;
   }
 
-  nsCOMPtr<nsIThread> encoderThread;
-  nsresult rv = NS_NewThread(getter_AddRefs(encoderThread), nullptr);
-  NS_ENSURE_SUCCESS(rv, rv);
+  nsresult rv = EnsureThreadPool();
+  if (NS_FAILED(rv)) {
+    return rv;
+  }
 
   RefPtr<EncodingCompleteEvent> completeEvent =
-    new EncodingCompleteEvent(encoderThread, aEncodeCallback);
+    new EncodingCompleteEvent(aEncodeCallback);
 
   nsCOMPtr<nsIRunnable> event = new EncodingRunnable(aType,
                                                      aOptions,
@@ -313,7 +325,7 @@ ImageEncoder::ExtractDataAsync(nsAString& aType,
                                                      aFormat,
                                                      aSize,
                                                      aUsingCustomOptions);
-  return encoderThread->Dispatch(event, NS_DISPATCH_NORMAL);
+  return sThreadPool->Dispatch(event, NS_DISPATCH_NORMAL);
 }
 
 /*static*/ nsresult
@@ -479,5 +491,48 @@ ImageEncoder::GetImageEncoder(nsAString& aType)
   return encoder.forget();
 }
 
+/* static */
+nsresult
+ImageEncoder::EnsureThreadPool()
+{
+  if (!sThreadPool) {
+    nsCOMPtr<nsIThreadPool> threadPool = do_CreateInstance(NS_THREADPOOL_CONTRACTID);
+    sThreadPool = threadPool;
+    if (!NS_IsMainThread()) {
+      NS_DispatchToMainThread(NS_NewRunnableFunction([]() -> void {
+        ClearOnShutdown(&sThreadPool);
+      }));
+    } else {
+      ClearOnShutdown(&sThreadPool);
+    }
+
+    const uint32_t kThreadLimit = 2;
+    const uint32_t kIdleThreadLimit = 1;
+    const uint32_t kIdleThreadTimeoutMs = 30000;
+
+    nsresult rv = sThreadPool->SetName(NS_LITERAL_CSTRING("EncodingRunnable"));
+    if (NS_WARN_IF(NS_FAILED(rv))) {
+      return rv;
+    }
+
+    rv = sThreadPool->SetThreadLimit(kThreadLimit);
+    if (NS_WARN_IF(NS_FAILED(rv))) {
+      return rv;
+    }
+
+    rv = sThreadPool->SetIdleThreadLimit(kIdleThreadLimit);
+    if (NS_WARN_IF(NS_FAILED(rv))) {
+      return rv;
+    }
+
+    rv = sThreadPool->SetIdleThreadTimeout(kIdleThreadTimeoutMs);
+    if (NS_WARN_IF(NS_FAILED(rv))) {
+      return rv;
+    }
+  }
+
+  return NS_OK;
+}
+
 } // namespace dom
 } // namespace mozilla

dom/base/ImageEncoder.h

@@ -16,6 +16,7 @@
 #include "nsSize.h"
 
 class nsICanvasRenderingContextInternal;
+class nsIThreadPool;
 
 namespace mozilla {
 
@@ -107,6 +108,11 @@ private:
   // undefined in this case.
   static already_AddRefed<imgIEncoder> GetImageEncoder(nsAString& aType);
 
+  static nsresult EnsureThreadPool();
+
+  // Thread pool for dispatching EncodingRunnable.
+  static StaticRefPtr<nsIThreadPool> sThreadPool;
+
   friend class EncodingRunnable;
 };
 

dom/base/StructuredCloneHolder.cpp

@@ -28,6 +28,7 @@
 #include "mozilla/dom/SubtleCryptoBinding.h"
 #include "mozilla/dom/ToJSValue.h"
 #include "mozilla/dom/WebCryptoCommon.h"
+#include "mozilla/gfx/2D.h"
 #include "mozilla/ipc/BackgroundChild.h"
 #include "mozilla/ipc/BackgroundUtils.h"
 #include "mozilla/ipc/PBackgroundSharedTypes.h"
@@ -306,7 +307,7 @@ StructuredCloneHolder::Read(nsISupports* aParent,
   // If we are tranferring something, we cannot call 'Read()' more than once.
   if (mSupportsTransferring) {
     mBlobImplArray.Clear();
-    mClonedImages.Clear();
+    mClonedSurfaces.Clear();
     Clear();
   }
 }
@@ -976,7 +977,7 @@ StructuredCloneHolder::CustomReadHandler(JSContext* aCx,
     nsCOMPtr<nsIGlobalObject> parent = do_QueryInterface(mParent);
     // aIndex is the index of the cloned image.
     return ImageBitmap::ReadStructuredClone(aCx, aReader,
-                                            parent, GetImages(), aIndex);
+                                            parent, GetSurfaces(), aIndex);
    }
 
   return ReadFullySerializableObjects(aCx, aReader, aTag);
@@ -1021,7 +1022,7 @@ StructuredCloneHolder::CustomWriteHandler(JSContext* aCx,
     ImageBitmap* imageBitmap = nullptr;
     if (NS_SUCCEEDED(UNWRAP_OBJECT(ImageBitmap, aObj, imageBitmap))) {
       return ImageBitmap::WriteStructuredClone(aWriter,
-                                               GetImages(),
+                                               GetSurfaces(),
                                                imageBitmap);
     }
   }
@@ -1072,7 +1073,8 @@ StructuredCloneHolder::CustomReadTransferHandler(JSContext* aCx,
     MOZ_ASSERT(aContent);
     OffscreenCanvasCloneData* data =
       static_cast<OffscreenCanvasCloneData*>(aContent);
-    RefPtr<OffscreenCanvas> canvas = OffscreenCanvas::CreateFromCloneData(data);
+    nsCOMPtr<nsIGlobalObject> parent = do_QueryInterface(mParent);
+    RefPtr<OffscreenCanvas> canvas = OffscreenCanvas::CreateFromCloneData(parent, data);
     delete data;
 
     JS::Rooted<JS::Value> value(aCx);
@@ -1085,6 +1087,26 @@ StructuredCloneHolder::CustomReadTransferHandler(JSContext* aCx,
     return true;
   }
 
+  if (aTag == SCTAG_DOM_IMAGEBITMAP) {
+    MOZ_ASSERT(mSupportedContext == SameProcessSameThread ||
+               mSupportedContext == SameProcessDifferentThread);
+    MOZ_ASSERT(aContent);
+    ImageBitmapCloneData* data =
+      static_cast<ImageBitmapCloneData*>(aContent);
+    nsCOMPtr<nsIGlobalObject> parent = do_QueryInterface(mParent);
+    RefPtr<ImageBitmap> bitmap = ImageBitmap::CreateFromCloneData(parent, data);
+    delete data;
+
+    JS::Rooted<JS::Value> value(aCx);
+    if (!GetOrCreateDOMReflector(aCx, bitmap, &value)) {
+      JS_ClearPendingException(aCx);
+      return false;
+    }
+
+    aReturnObject.set(&value.toObject());
+    return true;
+  }
+
   return false;
 }
 
@@ -1133,6 +1155,21 @@ StructuredCloneHolder::CustomWriteTransferHandler(JSContext* aCx,
 
         return true;
       }
+
+      ImageBitmap* bitmap = nullptr;
+      rv = UNWRAP_OBJECT(ImageBitmap, aObj, bitmap);
+      if (NS_SUCCEEDED(rv)) {
+        MOZ_ASSERT(bitmap);
+
+        *aExtraData = 0;
+        *aTag = SCTAG_DOM_IMAGEBITMAP;
+        *aOwnership = JS::SCTAG_TMO_CUSTOM;
+        *aContent = bitmap->ToCloneData();
+        MOZ_ASSERT(*aContent);
+        bitmap->Close();
+
+        return true;
+      }
     }
   }
 
@@ -1163,6 +1200,16 @@ StructuredCloneHolder::CustomFreeTransferHandler(uint32_t aTag,
     delete data;
     return;
   }
+
+  if (aTag == SCTAG_DOM_IMAGEBITMAP) {
+    MOZ_ASSERT(mSupportedContext == SameProcessSameThread ||
+               mSupportedContext == SameProcessDifferentThread);
+    MOZ_ASSERT(aContent);
+    ImageBitmapCloneData* data =
+      static_cast<ImageBitmapCloneData*>(aContent);
+    delete data;
+    return;
+  }
 }
 
 } // dom namespace

dom/base/StructuredCloneHolder.h

@@ -22,6 +22,10 @@ namespace layers {
 class Image;
 }
 
+namespace gfx {
+class DataSourceSurface;
+}
+
 namespace dom {
 
 class StructuredCloneHolderBase
@@ -181,7 +185,7 @@ public:
   bool HasClonedDOMObjects() const
   {
     return !mBlobImplArray.IsEmpty() ||
-           !mClonedImages.IsEmpty();
+           !mClonedSurfaces.IsEmpty();
   }
 
   nsTArray<RefPtr<BlobImpl>>& BlobImpls()
@@ -212,9 +216,9 @@ public:
     return mPortIdentifiers;
   }
 
-  nsTArray<RefPtr<layers::Image>>& GetImages()
+  nsTArray<RefPtr<gfx::DataSourceSurface>>& GetSurfaces()
   {
-    return mClonedImages;
+    return mClonedSurfaces;
   }
 
   // Implementations of the virtual methods to allow cloning of objects which
@@ -291,10 +295,10 @@ protected:
   nsTArray<RefPtr<BlobImpl>> mBlobImplArray;
 
   // This is used for sharing the backend of ImageBitmaps.
-  // The layers::Image object must be thread-safely reference-counted.
-  // The layers::Image object will not be written ever via any ImageBitmap
+  // The DataSourceSurface object must be thread-safely reference-counted.
+  // The DataSourceSurface object will not be written ever via any ImageBitmap
   // instance, so no race condition will occur.
-  nsTArray<RefPtr<layers::Image>> mClonedImages;
+  nsTArray<RefPtr<gfx::DataSourceSurface>> mClonedSurfaces;
 
   // This raw pointer is only set within ::Read() and is unset by the end.
   nsISupports* MOZ_NON_OWNING_REF mParent;

dom/base/nsContentUtils.cpp

@@ -6775,66 +6775,6 @@ nsContentUtils::HaveEqualPrincipals(nsIDocument* aDoc1, nsIDocument* aDoc2)
   return principalsEqual;
 }
 
-static void
-CheckForWindowedPlugins(nsISupports* aSupports, void* aResult)
-{
-  nsCOMPtr<nsIContent> content(do_QueryInterface(aSupports));
-  if (!content || !content->IsInDoc()) {
-    return;
-  }
-  nsCOMPtr<nsIObjectLoadingContent> olc(do_QueryInterface(content));
-  if (!olc) {
-    return;
-  }
-  RefPtr<nsNPAPIPluginInstance> plugin;
-  olc->GetPluginInstance(getter_AddRefs(plugin));
-  if (!plugin) {
-    return;
-  }
-  bool isWindowless = false;
-  nsresult res = plugin->IsWindowless(&isWindowless);
-  if (NS_SUCCEEDED(res) && !isWindowless) {
-    *static_cast<bool*>(aResult) = true;
-  }
-}
-
-static bool
-DocTreeContainsWindowedPlugins(nsIDocument* aDoc, void* aResult)
-{
-  if (!nsContentUtils::IsChromeDoc(aDoc)) {
-    aDoc->EnumerateActivityObservers(CheckForWindowedPlugins, aResult);
-  }
-  if (*static_cast<bool*>(aResult)) {
-    // Return false to stop iteration, we found a windowed plugin.
-    return false;
-  }
-  aDoc->EnumerateSubDocuments(DocTreeContainsWindowedPlugins, aResult);
-  // Return false to stop iteration if we found a windowed plugin in
-  // the sub documents.
-  return !*static_cast<bool*>(aResult);
-}
-
-/* static */
-bool
-nsContentUtils::HasPluginWithUncontrolledEventDispatch(nsIDocument* aDoc)
-{
-#ifdef XP_MACOSX
-  // We control dispatch to all mac plugins.
-  return false;
-#endif
-  bool result = false;
-  
-  // Find the top of the document's branch, the child of the chrome document.
-  nsIDocument* doc = aDoc;
-  nsIDocument* parent = nullptr;
-  while (doc && (parent = doc->GetParentDocument()) && !IsChromeDoc(parent)) {
-    doc = parent;
-  }
-
-  DocTreeContainsWindowedPlugins(doc, &result);
-  return result;
-}
-
 /* static */
 bool
 nsContentUtils::HasPluginWithUncontrolledEventDispatch(nsIContent* aContent)
@@ -6842,10 +6782,30 @@ nsContentUtils::HasPluginWithUncontrolledEventDispatch(nsIContent* aContent)
 #ifdef XP_MACOSX
   // We control dispatch to all mac plugins.
   return false;
+#else
+  if (!aContent || !aContent->IsInDoc()) {
+    return false;
+  }
+
+  nsCOMPtr<nsIObjectLoadingContent> olc = do_QueryInterface(aContent);
+  if (!olc) {
+    return false;
+  }
+
+  RefPtr<nsNPAPIPluginInstance> plugin;
+  olc->GetPluginInstance(getter_AddRefs(plugin));
+  if (!plugin) {
+    return false;
+  }
+
+  bool isWindowless = false;
+  nsresult res = plugin->IsWindowless(&isWindowless);
+  if (NS_FAILED(res)) {
+    return false;
+  }
+
+  return !isWindowless;
 #endif
-  bool result = false;
-  CheckForWindowedPlugins(aContent, &result);
-  return result;
 }
 
 /* static */

dom/base/nsContentUtils.h

@@ -2059,14 +2059,6 @@ public:
     return sPrivacyResistFingerprinting;
   }
 
-  /**
-   * Returns true if the doc tree branch which contains aDoc contains any
-   * plugins which we don't control event dispatch for, i.e. do any plugins
-   * in the same tab as this document receive key events outside of our
-   * control? This always returns false on MacOSX.
-   */
-  static bool HasPluginWithUncontrolledEventDispatch(nsIDocument* aDoc);
-
   /**
    * Return true if this doc is controlled by a ServiceWorker.
    */

dom/base/nsGlobalWindow.cpp

@@ -7668,7 +7668,6 @@ nsGlobalWindow::Open(const nsAString& aUrl, const nsAString& aName,
                              false,          // aDoJSFixups
                              true,           // aNavigate
                              nullptr, nullptr,  // No args
-                             GetPrincipal(),    // aCalleePrincipal
                              nullptr,           // aJSCallerContext
                              getter_AddRefs(window));
   if (NS_SUCCEEDED(rv) && window) {
@@ -7689,7 +7688,6 @@ nsGlobalWindow::OpenJS(const nsAString& aUrl, const nsAString& aName,
                       true,           // aDoJSFixups
                       true,           // aNavigate
                       nullptr, nullptr,  // No args
-                      GetPrincipal(),    // aCalleePrincipal
                       nsContentUtils::GetCurrentJSContext(), // aJSCallerContext
                       _retval);
 }
@@ -7709,7 +7707,6 @@ nsGlobalWindow::OpenDialog(const nsAString& aUrl, const nsAString& aName,
                       false,                   // aDoJSFixups
                       true,                    // aNavigate
                       nullptr, aExtraArgument,    // Arguments
-                      GetPrincipal(),             // aCalleePrincipal
                       nullptr,                    // aJSCallerContext
                       _retval);
 }
@@ -7729,7 +7726,6 @@ nsGlobalWindow::OpenNoNavigate(const nsAString& aUrl,
                       false,          // aDoJSFixups
                       false,          // aNavigate
                       nullptr, nullptr,  // No args
-                      GetPrincipal(),    // aCalleePrincipal
                       nullptr,           // aJSCallerContext
                       _retval);
 
@@ -7759,7 +7755,6 @@ nsGlobalWindow::OpenDialogOuter(JSContext* aCx, const nsAString& aUrl,
                         false,            // aDoJSFixups
                         true,                // aNavigate
                         argvArray, nullptr,  // Arguments
-                        GetPrincipal(),      // aCalleePrincipal
                         aCx,                 // aJSCallerContext
                         getter_AddRefs(dialog));
   return dialog.forget();
@@ -8839,7 +8834,6 @@ nsGlobalWindow::ShowModalDialogOuter(const nsAString& aUrl, nsIVariant* aArgumen
                         true,           // aDoJSFixups
                         true,           // aNavigate
                         nullptr, argHolder, // args
-                        GetPrincipal(),     // aCalleePrincipal
                         nullptr,            // aJSCallerContext
                         getter_AddRefs(dlgWin));
   nsContentUtils::SetMicroTaskLevel(oldMicroTaskLevel);
@@ -11270,7 +11264,6 @@ nsGlobalWindow::OpenInternal(const nsAString& aUrl, const nsAString& aName,
                              bool aDoJSFixups, bool aNavigate,
                              nsIArray *argv,
                              nsISupports *aExtraArgument,
-                             nsIPrincipal *aCalleePrincipal,
                              JSContext *aJSCallerContext,
                              nsIDOMWindow **aReturn)
 {

dom/base/nsGlobalWindow.h

@@ -1392,7 +1392,6 @@ private:
                                     bool aNavigate,
                                     nsIArray *argv,
                                     nsISupports *aExtraArgument,
-                                    nsIPrincipal *aCalleePrincipal,
                                     JSContext *aJSCallerContext,
                                     nsIDOMWindow **aReturn);
 

dom/canvas/CanvasRenderingContext2D.cpp

@@ -5219,19 +5219,17 @@ CanvasRenderingContext2D::GetImageDataArray(JSContext* aCx,
   IntRect dstWriteRect = srcReadRect;
   dstWriteRect.MoveBy(-aX, -aY);
 
-  uint8_t* src;
-  uint32_t srcStride;
-
-  if (readback) {
-    srcStride = rawData.mStride;
-    src = rawData.mData + srcReadRect.y * srcStride + srcReadRect.x * 4;
-  }
-
   JS::AutoCheckCannotGC nogc;
   bool isShared;
   uint8_t* data = JS_GetUint8ClampedArrayData(darray, &isShared, nogc);
   MOZ_ASSERT(!isShared);        // Should not happen, data was created above
-  if (!readback) {
+
+  uint8_t* src;
+  uint32_t srcStride;
+  if (readback) {
+    srcStride = rawData.mStride;
+    src = rawData.mData + srcReadRect.y * srcStride + srcReadRect.x * 4;
+  } else {
     src = data;
     srcStride = aWidth * 4;
   }
@@ -5579,9 +5577,9 @@ CanvasRenderingContext2D::GetBufferProvider(LayerManager* aManager)
   return mBufferProvider;
 }
 
-already_AddRefed<CanvasLayer>
+already_AddRefed<Layer>
 CanvasRenderingContext2D::GetCanvasLayer(nsDisplayListBuilder* aBuilder,
-                                         CanvasLayer *aOldLayer,
+                                         Layer *aOldLayer,
                                          LayerManager *aManager)
 {
   if (mOpaque || mIsSkiaGL) {
@@ -5624,8 +5622,10 @@ CanvasRenderingContext2D::GetCanvasLayer(nsDisplayListBuilder* aBuilder,
       data.mBufferProvider = provider;
     }
 
-    if (userData && userData->IsForContext(this) && aOldLayer->IsDataValid(data)) {
-      RefPtr<CanvasLayer> ret = aOldLayer;
+    if (userData &&
+        userData->IsForContext(this) &&
+        static_cast<CanvasLayer*>(aOldLayer)->IsDataValid(data)) {
+      RefPtr<Layer> ret = aOldLayer;
       return ret.forget();
     }
   }

dom/canvas/CanvasRenderingContext2D.h

@@ -459,8 +459,8 @@ public:
   bool GetIsOpaque() override { return mOpaque; }
   NS_IMETHOD Reset() override;
   mozilla::layers::PersistentBufferProvider* GetBufferProvider(mozilla::layers::LayerManager* aManager);
-  already_AddRefed<CanvasLayer> GetCanvasLayer(nsDisplayListBuilder* aBuilder,
-                                               CanvasLayer *aOldLayer,
+  already_AddRefed<Layer> GetCanvasLayer(nsDisplayListBuilder* aBuilder,
+                                         Layer *aOldLayer,
                                          LayerManager *aManager) override;
   virtual bool ShouldForceInactiveLayer(LayerManager *aManager) override;
   void MarkContextClean() override;

dom/canvas/CanvasRenderingContextHelper.cpp

@@ -4,6 +4,7 @@
  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
 
 #include "CanvasRenderingContextHelper.h"
+#include "ImageBitmapRenderingContext.h"
 #include "ImageEncoder.h"
 #include "mozilla/dom/CanvasRenderingContext2D.h"
 #include "mozilla/Telemetry.h"
@@ -26,36 +27,6 @@ CanvasRenderingContextHelper::ToBlob(JSContext* aCx,
                                      JS::Handle<JS::Value> aParams,
                                      ErrorResult& aRv)
 {
-  nsAutoString type;
-  nsContentUtils::ASCIIToLower(aType, type);
-
-  nsAutoString params;
-  bool usingCustomParseOptions;
-  aRv = ParseParams(aCx, type, aParams, params, &usingCustomParseOptions);
-  if (aRv.Failed()) {
-    return;
-  }
-
-  if (mCurrentContext) {
-    // We disallow canvases of width or height zero, and set them to 1, so
-    // we will have a discrepancy with the sizes of the canvas and the context.
-    // That discrepancy is OK, the rest are not.
-    nsIntSize elementSize = GetWidthHeight();
-    if ((elementSize.width != mCurrentContext->GetWidth() &&
-         (elementSize.width != 0 || mCurrentContext->GetWidth() != 1)) ||
-        (elementSize.height != mCurrentContext->GetHeight() &&
-         (elementSize.height != 0 || mCurrentContext->GetHeight() != 1))) {
-      aRv.Throw(NS_ERROR_FAILURE);
-      return;
-    }
-  }
-
-  UniquePtr<uint8_t[]> imageBuffer;
-  int32_t format = 0;
-  if (mCurrentContext) {
-    imageBuffer = mCurrentContext->GetImageBuffer(&format);
-  }
-
   // Encoder callback when encoding is complete.
   class EncodeCallback : public EncodeCompleteCallback
   {
@@ -97,6 +68,49 @@ CanvasRenderingContextHelper::ToBlob(JSContext* aCx,
   RefPtr<EncodeCompleteCallback> callback =
     new EncodeCallback(aGlobal, &aCallback);
 
+  ToBlob(aCx, aGlobal, callback, aType, aParams, aRv);
+}
+
+void
+CanvasRenderingContextHelper::ToBlob(JSContext* aCx,
+                                     nsIGlobalObject* aGlobal,
+                                     EncodeCompleteCallback* aCallback,
+                                     const nsAString& aType,
+                                     JS::Handle<JS::Value> aParams,
+                                     ErrorResult& aRv)
+{
+  nsAutoString type;
+  nsContentUtils::ASCIIToLower(aType, type);
+
+  nsAutoString params;
+  bool usingCustomParseOptions;
+  aRv = ParseParams(aCx, type, aParams, params, &usingCustomParseOptions);
+  if (aRv.Failed()) {
+    return;
+  }
+
+  if (mCurrentContext) {
+    // We disallow canvases of width or height zero, and set them to 1, so
+    // we will have a discrepancy with the sizes of the canvas and the context.
+    // That discrepancy is OK, the rest are not.
+    nsIntSize elementSize = GetWidthHeight();
+    if ((elementSize.width != mCurrentContext->GetWidth() &&
+         (elementSize.width != 0 || mCurrentContext->GetWidth() != 1)) ||
+        (elementSize.height != mCurrentContext->GetHeight() &&
+         (elementSize.height != 0 || mCurrentContext->GetHeight() != 1))) {
+      aRv.Throw(NS_ERROR_FAILURE);
+      return;
+    }
+  }
+
+  UniquePtr<uint8_t[]> imageBuffer;
+  int32_t format = 0;
+  if (mCurrentContext) {
+    imageBuffer = mCurrentContext->GetImageBuffer(&format);
+  }
+
+  RefPtr<EncodeCompleteCallback> callback = aCallback;
+
   aRv = ImageEncoder::ExtractDataAsync(type,
                                        params,
                                        usingCustomParseOptions,
@@ -138,6 +152,11 @@ CanvasRenderingContextHelper::CreateContext(CanvasContextType aContextType)
       return nullptr;
 
     break;
+
+  case CanvasContextType::ImageBitmap:
+    ret = new ImageBitmapRenderingContext();
+
+    break;
   }
   MOZ_ASSERT(ret);
 

dom/canvas/CanvasRenderingContextHelper.h

@@ -18,13 +18,15 @@ class ErrorResult;
 
 namespace dom {
 
+class EncodeCompleteCallback;
 class FileCallback;
 
 enum class CanvasContextType : uint8_t {
   NoContext,
   Canvas2D,
   WebGL1,
-  WebGL2
+  WebGL2,
+  ImageBitmap
 };
 
 /**
@@ -57,6 +59,10 @@ protected:
               const nsAString& aType, JS::Handle<JS::Value> aParams,
               ErrorResult& aRv);
 
+  void ToBlob(JSContext* aCx, nsIGlobalObject* aGlobal, EncodeCompleteCallback* aCallback,
+              const nsAString& aType, JS::Handle<JS::Value> aParams,
+              ErrorResult& aRv);
+
   virtual already_AddRefed<nsICanvasRenderingContextInternal>
   CreateContext(CanvasContextType aContextType);
 

dom/canvas/CanvasUtils.cpp

@@ -61,6 +61,11 @@ GetCanvasContextType(const nsAString& str, dom::CanvasContextType* const out_typ
     }
   }
 
+  if (str.EqualsLiteral("bitmaprenderer")) {
+    *out_type = dom::CanvasContextType::ImageBitmap;
+    return true;
+  }
+
   return false;
 }
 

dom/canvas/ImageBitmap.cpp

@@ -5,6 +5,7 @@
  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
 
 #include "mozilla/dom/ImageBitmap.h"
+
 #include "mozilla/dom/ImageBitmapBinding.h"
 #include "mozilla/dom/Promise.h"
 #include "mozilla/dom/StructuredCloneTags.h"
@@ -145,15 +146,14 @@ CropAndCopyDataSourceSurface(DataSourceSurface* aSurface, const IntRect& aCropRe
 }
 
 /*
- * Encapsulate the given _aSurface_ into a layers::CairoImage.
+ * Encapsulate the given _aSurface_ into a layers::SourceSurfaceImage.
  */
 static already_AddRefed<layers::Image>
 CreateImageFromSurface(SourceSurface* aSurface)
 {
   MOZ_ASSERT(aSurface);
-  RefPtr<layers::CairoImage> image =
-    new layers::CairoImage(aSurface->GetSize(), aSurface);
-
+  RefPtr<layers::SourceSurfaceImage> image =
+    new layers::SourceSurfaceImage(aSurface->GetSize(), aSurface);
   return image.forget();
 }
 
@@ -250,13 +250,13 @@ CreateImageFromRawData(const gfx::IntSize& aSize,
 
 /*
  * This is a synchronous task.
- * This class is used to create a layers::CairoImage from raw data in the main
+ * This class is used to create a layers::SourceSurfaceImage from raw data in the main
  * thread. While creating an ImageBitmap from an ImageData, we need to create
  * a SouceSurface from the ImageData's raw data and then set the SourceSurface
- * into a layers::CairoImage. However, the layers::CairoImage asserts the
+ * into a layers::SourceSurfaceImage. However, the layers::SourceSurfaceImage asserts the
  * setting operation in the main thread, so if we are going to create an
  * ImageBitmap from an ImageData off the main thread, we post an event to the
- * main thread to create a layers::CairoImage from an ImageData's raw data.
+ * main thread to create a layers::SourceSurfaceImage from an ImageData's raw data.
  */
 class CreateImageFromRawDataInMainThreadSyncTask final :
   public WorkerMainThreadRunnable
@@ -408,6 +408,14 @@ ImageBitmap::WrapObject(JSContext* aCx, JS::Handle<JSObject*> aGivenProto)
   return ImageBitmapBinding::Wrap(aCx, this, aGivenProto);
 }
 
+void
+ImageBitmap::Close()
+{
+  mData = nullptr;
+  mSurface = nullptr;
+  mPictureRect.SetEmpty();
+}
+
 void
 ImageBitmap::SetPictureRect(const IntRect& aRect, ErrorResult& aRv)
 {
@@ -419,6 +427,10 @@ ImageBitmap::PrepareForDrawTarget(gfx::DrawTarget* aTarget)
 {
   MOZ_ASSERT(aTarget);
 
+  if (!mData) {
+    return nullptr;
+  }
+
   if (!mSurface) {
     mSurface = mData->GetAsSourceSurface();
   }
@@ -493,6 +505,68 @@ ImageBitmap::PrepareForDrawTarget(gfx::DrawTarget* aTarget)
   return surface.forget();
 }
 
+already_AddRefed<layers::Image>
+ImageBitmap::TransferAsImage()
+{
+  RefPtr<layers::Image> image = mData;
+  Close();
+  return image.forget();
+}
+
+ImageBitmapCloneData*
+ImageBitmap::ToCloneData()
+{
+  ImageBitmapCloneData* result = new ImageBitmapCloneData();
+  result->mPictureRect = mPictureRect;
+  RefPtr<SourceSurface> surface = mData->GetAsSourceSurface();
+  result->mSurface = surface->GetDataSurface();
+  MOZ_ASSERT(result->mSurface);
+
+  return result;
+}
+
+/* static */ already_AddRefed<ImageBitmap>
+ImageBitmap::CreateFromCloneData(nsIGlobalObject* aGlobal,
+                                 ImageBitmapCloneData* aData)
+{
+  RefPtr<layers::Image> data =
+    CreateImageFromSurface(aData->mSurface);
+
+  RefPtr<ImageBitmap> ret = new ImageBitmap(aGlobal, data);
+  ErrorResult rv;
+  ret->SetPictureRect(aData->mPictureRect, rv);
+  return ret.forget();
+}
+
+/* static */ already_AddRefed<ImageBitmap>
+ImageBitmap::CreateFromOffscreenCanvas(nsIGlobalObject* aGlobal,
+                                       OffscreenCanvas& aOffscreenCanvas,
+                                       ErrorResult& aRv)
+{
+  // Check origin-clean.
+  if (aOffscreenCanvas.IsWriteOnly()) {
+    aRv.Throw(NS_ERROR_DOM_SECURITY_ERR);
+    return nullptr;
+  }
+
+  nsLayoutUtils::SurfaceFromElementResult res =
+    nsLayoutUtils::SurfaceFromOffscreenCanvas(&aOffscreenCanvas,
+                                              nsLayoutUtils::SFE_WANT_FIRST_FRAME);
+
+  RefPtr<SourceSurface> surface = res.GetSourceSurface();
+
+  if (NS_WARN_IF(!surface)) {
+    aRv.Throw(NS_ERROR_NOT_AVAILABLE);
+    return nullptr;
+  }
+
+  RefPtr<layers::Image> data =
+    CreateImageFromSurface(surface);
+
+  RefPtr<ImageBitmap> ret = new ImageBitmap(aGlobal, data);
+  return ret.forget();
+}
+
 /* static */ already_AddRefed<ImageBitmap>
 ImageBitmap::CreateInternal(nsIGlobalObject* aGlobal, HTMLImageElement& aImageEl,
                             const Maybe<IntRect>& aCropRect, ErrorResult& aRv)
@@ -1154,7 +1228,7 @@ ImageBitmap::Create(nsIGlobalObject* aGlobal, const ImageBitmapSource& aSrc,
 ImageBitmap::ReadStructuredClone(JSContext* aCx,
                                  JSStructuredCloneReader* aReader,
                                  nsIGlobalObject* aParent,
-                                 const nsTArray<RefPtr<layers::Image>>& aClonedImages,
+                                 const nsTArray<RefPtr<DataSourceSurface>>& aClonedSurfaces,
                                  uint32_t aIndex)
 {
   MOZ_ASSERT(aCx);
@@ -1177,8 +1251,8 @@ ImageBitmap::ReadStructuredClone(JSContext* aCx,
   int32_t picRectHeight = BitwiseCast<int32_t>(picRectHeight_);
 
   // Create a new ImageBitmap.
-  MOZ_ASSERT(!aClonedImages.IsEmpty());
-  MOZ_ASSERT(aIndex < aClonedImages.Length());
+  MOZ_ASSERT(!aClonedSurfaces.IsEmpty());
+  MOZ_ASSERT(aIndex < aClonedSurfaces.Length());
 
   // RefPtr<ImageBitmap> needs to go out of scope before toObjectOrNull() is
   // called because the static analysis thinks dereferencing XPCOM objects
@@ -1187,8 +1261,9 @@ ImageBitmap::ReadStructuredClone(JSContext* aCx,
   // while destructors are running.
   JS::Rooted<JS::Value> value(aCx);
   {
+    RefPtr<layers::Image> img = CreateImageFromSurface(aClonedSurfaces[aIndex]);
     RefPtr<ImageBitmap> imageBitmap =
-      new ImageBitmap(aParent, aClonedImages[aIndex]);
+      new ImageBitmap(aParent, img);
 
     ErrorResult error;
     imageBitmap->SetPictureRect(IntRect(picRectX, picRectY,
@@ -1208,7 +1283,7 @@ ImageBitmap::ReadStructuredClone(JSContext* aCx,
 
 /*static*/ bool
 ImageBitmap::WriteStructuredClone(JSStructuredCloneWriter* aWriter,
-                                  nsTArray<RefPtr<layers::Image>>& aClonedImages,
+                                  nsTArray<RefPtr<DataSourceSurface>>& aClonedSurfaces,
                                   ImageBitmap* aImageBitmap)
 {
   MOZ_ASSERT(aWriter);
@@ -1219,8 +1294,8 @@ ImageBitmap::WriteStructuredClone(JSStructuredCloneWriter* aWriter,
   const uint32_t picRectWidth = BitwiseCast<uint32_t>(aImageBitmap->mPictureRect.width);
   const uint32_t picRectHeight = BitwiseCast<uint32_t>(aImageBitmap->mPictureRect.height);
 
-  // Indexing the cloned images and send the index to the receiver.
-  uint32_t index = aClonedImages.Length();
+  // Indexing the cloned surfaces and send the index to the receiver.
+  uint32_t index = aClonedSurfaces.Length();
 
   if (NS_WARN_IF(!JS_WriteUint32Pair(aWriter, SCTAG_DOM_IMAGEBITMAP, index)) ||
       NS_WARN_IF(!JS_WriteUint32Pair(aWriter, picRectX, picRectY)) ||
@@ -1228,8 +1303,24 @@ ImageBitmap::WriteStructuredClone(JSStructuredCloneWriter* aWriter,
     return false;
   }
 
-  aClonedImages.AppendElement(aImageBitmap->mData);
-
+  RefPtr<SourceSurface> surface =
+    aImageBitmap->mData->GetAsSourceSurface();
+  RefPtr<DataSourceSurface> snapshot = surface->GetDataSurface();
+  RefPtr<DataSourceSurface> dstDataSurface;
+  {
+    // DataSourceSurfaceD2D1::GetStride() will call EnsureMapped implicitly and
+    // won't Unmap after exiting function. So instead calling GetStride()
+    // directly, using ScopedMap to get stride.
+    DataSourceSurface::ScopedMap map(snapshot, DataSourceSurface::READ);
+    dstDataSurface =
+      Factory::CreateDataSourceSurfaceWithStride(snapshot->GetSize(),
+                                                 snapshot->GetFormat(),
+                                                 map.GetStride(),
+                                                 true);
+  }
+  MOZ_ASSERT(dstDataSurface);
+  Factory::CopyDataSourceSurface(snapshot, dstDataSurface);
+  aClonedSurfaces.AppendElement(dstDataSurface);
   return true;
 }
 

dom/canvas/ImageBitmap.h

@@ -25,6 +25,7 @@ namespace mozilla {
 class ErrorResult;
 
 namespace gfx {
+class DataSourceSurface;
 class SourceSurface;
 }
 
@@ -33,6 +34,7 @@ class Image;
 }
 
 namespace dom {
+class OffscreenCanvas;
 
 namespace workers {
 class WorkerStructuredCloneClosure;
@@ -50,6 +52,12 @@ class CreateImageBitmapFromBlob;
 class CreateImageBitmapFromBlobTask;
 class CreateImageBitmapFromBlobWorkerTask;
 
+struct ImageBitmapCloneData final
+{
+  RefPtr<gfx::DataSourceSurface> mSurface;
+  gfx::IntRect mPictureRect;
+};
+
 /*
  * ImageBitmap is an opaque handler to several kinds of image-like objects from
  * HTMLImageElement, HTMLVideoElement, HTMLCanvasElement, ImageData to
@@ -83,6 +91,8 @@ public:
     return mPictureRect.Height();
   }
 
+  void Close();
+
   /*
    * The PrepareForDrawTarget() might return null if the mPictureRect does not
    * intersect with the size of mData.
@@ -90,6 +100,24 @@ public:
   already_AddRefed<gfx::SourceSurface>
   PrepareForDrawTarget(gfx::DrawTarget* aTarget);
 
+  /*
+   * Transfer ownership of buffer to caller. So this function call
+   * Close() implicitly.
+   */
+  already_AddRefed<layers::Image>
+  TransferAsImage();
+
+  ImageBitmapCloneData*
+  ToCloneData();
+
+  static already_AddRefed<ImageBitmap>
+  CreateFromCloneData(nsIGlobalObject* aGlobal, ImageBitmapCloneData* aData);
+
+  static already_AddRefed<ImageBitmap>
+  CreateFromOffscreenCanvas(nsIGlobalObject* aGlobal,
+                            OffscreenCanvas& aOffscreenCanvas,
+                            ErrorResult& aRv);
+
   static already_AddRefed<Promise>
   Create(nsIGlobalObject* aGlobal, const ImageBitmapSource& aSrc,
          const Maybe<gfx::IntRect>& aCropRect, ErrorResult& aRv);
@@ -98,12 +126,12 @@ public:
   ReadStructuredClone(JSContext* aCx,
                       JSStructuredCloneReader* aReader,
                       nsIGlobalObject* aParent,
-                      const nsTArray<RefPtr<layers::Image>>& aClonedImages,
+                      const nsTArray<RefPtr<gfx::DataSourceSurface>>& aClonedSurfaces,
                       uint32_t aIndex);
 
   static bool
   WriteStructuredClone(JSStructuredCloneWriter* aWriter,
-                       nsTArray<RefPtr<layers::Image>>& aClonedImages,
+                       nsTArray<RefPtr<gfx::DataSourceSurface>>& aClonedSurfaces,
                        ImageBitmap* aImageBitmap);
 
   friend CreateImageBitmapFromBlob;

dom/canvas/ImageBitmapRenderingContext.cpp

@@ -0,0 +1,303 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "ImageBitmapRenderingContext.h"
+#include "mozilla/dom/ImageBitmapRenderingContextBinding.h"
+#include "ImageContainer.h"
+#include "ImageLayers.h"
+
+namespace mozilla {
+namespace dom {
+
+ImageBitmapRenderingContext::ImageBitmapRenderingContext()
+  : mWidth(0)
+  , mHeight(0)
+{
+}
+
+ImageBitmapRenderingContext::~ImageBitmapRenderingContext()
+{
+  RemovePostRefreshObserver();
+}
+
+JSObject*
+ImageBitmapRenderingContext::WrapObject(JSContext* aCx, JS::Handle<JSObject*> aGivenProto)
+{
+  return ImageBitmapRenderingContextBinding::Wrap(aCx, this, aGivenProto);
+}
+
+already_AddRefed<layers::Image>
+ImageBitmapRenderingContext::ClipToIntrinsicSize()
+{
+  if (!mImage) {
+    return nullptr;
+  }
+
+  // If image is larger than canvas intrinsic size, clip it to the intrinsic size.
+  RefPtr<gfx::SourceSurface> surface;
+  RefPtr<layers::Image> result;
+  if (mWidth < mImage->GetSize().width ||
+      mHeight < mImage->GetSize().height) {
+    surface = MatchWithIntrinsicSize();
+  } else {
+    surface = mImage->GetAsSourceSurface();
+  }
+  result = new layers::SourceSurfaceImage(gfx::IntSize(mWidth, mHeight), surface);
+  return result.forget();
+}
+
+void
+ImageBitmapRenderingContext::TransferImageBitmap(ImageBitmap& aImageBitmap)
+{
+  Reset();
+  mImage = aImageBitmap.TransferAsImage();
+
+  if (!mImage) {
+    return;
+  }
+
+  Redraw(gfxRect(0, 0, mWidth, mHeight));
+}
+
+int32_t
+ImageBitmapRenderingContext::GetWidth() const
+{
+  return mWidth;
+}
+
+int32_t
+ImageBitmapRenderingContext::GetHeight() const
+{
+  return mHeight;
+}
+
+NS_IMETHODIMP
+ImageBitmapRenderingContext::SetDimensions(int32_t aWidth, int32_t aHeight)
+{
+  mWidth = aWidth;
+  mHeight = aHeight;
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+ImageBitmapRenderingContext::InitializeWithSurface(nsIDocShell* aDocShell,
+                                                   gfxASurface* aSurface,
+                                                   int32_t aWidth,
+                                                   int32_t aHeight)
+{
+  return NS_ERROR_NOT_IMPLEMENTED;
+}
+
+already_AddRefed<DataSourceSurface>
+ImageBitmapRenderingContext::MatchWithIntrinsicSize()
+{
+  RefPtr<SourceSurface> surface = mImage->GetAsSourceSurface();
+  RefPtr<DataSourceSurface> temp =
+    Factory::CreateDataSourceSurface(IntSize(mWidth, mHeight), surface->GetFormat());
+  if (!temp) {
+    return nullptr;
+  }
+
+  DataSourceSurface::ScopedMap map(temp, DataSourceSurface::READ_WRITE);
+  if (!map.IsMapped()) {
+    return nullptr;
+  }
+
+  RefPtr<DrawTarget> dt =
+    Factory::CreateDrawTargetForData(BackendType::CAIRO,
+                                     map.GetData(),
+                                     temp->GetSize(),
+                                     map.GetStride(),
+                                     temp->GetFormat());
+  if (!dt) {
+    return nullptr;
+  }
+
+
+  dt->ClearRect(Rect(0, 0, mWidth, mHeight));
+  dt->CopySurface(surface,
+                  IntRect(0, 0, surface->GetSize().width,
+                                surface->GetSize().height),
+                  IntPoint(0, 0));
+
+  return temp.forget();
+}
+
+mozilla::UniquePtr<uint8_t[]>
+ImageBitmapRenderingContext::GetImageBuffer(int32_t* aFormat)
+{
+  *aFormat = 0;
+
+  if (!mImage) {
+    return nullptr;
+  }
+
+  RefPtr<SourceSurface> surface = mImage->GetAsSourceSurface();
+  RefPtr<DataSourceSurface> data = surface->GetDataSurface();
+  if (!data) {
+    return nullptr;
+  }
+
+  if (data->GetSize() != IntSize(mWidth, mHeight)) {
+    data = MatchWithIntrinsicSize();
+  }
+
+  *aFormat = imgIEncoder::INPUT_FORMAT_HOSTARGB;
+  return SurfaceToPackedBGRA(data);
+}
+
+NS_IMETHODIMP
+ImageBitmapRenderingContext::GetInputStream(const char* aMimeType,
+                                            const char16_t* aEncoderOptions,
+                                            nsIInputStream** aStream)
+{
+  nsCString enccid("@mozilla.org/image/encoder;2?type=");
+  enccid += aMimeType;
+  nsCOMPtr<imgIEncoder> encoder = do_CreateInstance(enccid.get());
+  if (!encoder) {
+    return NS_ERROR_FAILURE;
+  }
+
+  int32_t format = 0;
+  UniquePtr<uint8_t[]> imageBuffer = GetImageBuffer(&format);
+  if (!imageBuffer) {
+    return NS_ERROR_FAILURE;
+  }
+
+  return ImageEncoder::GetInputStream(mWidth, mHeight, imageBuffer.get(), format,
+                                      encoder, aEncoderOptions, aStream);
+}
+
+already_AddRefed<mozilla::gfx::SourceSurface>
+ImageBitmapRenderingContext::GetSurfaceSnapshot(bool* aPremultAlpha)
+{
+  if (!mImage) {
+    return nullptr;
+  }
+
+  if (aPremultAlpha) {
+    *aPremultAlpha = true;
+  }
+
+  RefPtr<SourceSurface> surface = mImage->GetAsSourceSurface();
+  if (surface->GetSize() != IntSize(mWidth, mHeight)) {
+    return MatchWithIntrinsicSize();
+  }
+
+  return surface.forget();
+}
+
+NS_IMETHODIMP
+ImageBitmapRenderingContext::SetIsOpaque(bool aIsOpaque)
+{
+  return NS_OK;
+}
+
+bool
+ImageBitmapRenderingContext::GetIsOpaque()
+{
+  return false;
+}
+
+NS_IMETHODIMP
+ImageBitmapRenderingContext::Reset()
+{
+  if (mCanvasElement) {
+    mCanvasElement->InvalidateCanvas();
+  }
+
+  mImage = nullptr;
+
+  return NS_OK;
+}
+
+already_AddRefed<Layer>
+ImageBitmapRenderingContext::GetCanvasLayer(nsDisplayListBuilder* aBuilder,
+                                            Layer* aOldLayer,
+                                            LayerManager* aManager)
+{
+  if (!mImage) {
+    // No DidTransactionCallback will be received, so mark the context clean
+    // now so future invalidations will be dispatched.
+    MarkContextClean();
+    return nullptr;
+  }
+
+  RefPtr<ImageLayer> imageLayer;
+
+  if (aOldLayer) {
+    imageLayer = static_cast<ImageLayer*>(aOldLayer);
+  } else {
+    imageLayer = aManager->CreateImageLayer();
+  }
+
+  RefPtr<ImageContainer> imageContainer = imageLayer->GetContainer();
+  if (!imageContainer) {
+    imageContainer = aManager->CreateImageContainer();
+    imageLayer->SetContainer(imageContainer);
+  }
+
+  nsAutoTArray<ImageContainer::NonOwningImage, 1> imageList;
+  RefPtr<layers::Image> image = ClipToIntrinsicSize();
+  imageList.AppendElement(ImageContainer::NonOwningImage(image));
+  imageContainer->SetCurrentImages(imageList);
+
+  return imageLayer.forget();
+}
+
+void
+ImageBitmapRenderingContext::MarkContextClean()
+{
+}
+
+NS_IMETHODIMP
+ImageBitmapRenderingContext::Redraw(const gfxRect& aDirty)
+{
+  if (!mCanvasElement) {
+    return NS_OK;
+  }
+
+  mozilla::gfx::Rect rect = ToRect(aDirty);
+  mCanvasElement->InvalidateCanvasContent(&rect);
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+ImageBitmapRenderingContext::SetIsIPC(bool aIsIPC)
+{
+  return NS_OK;
+}
+
+void
+ImageBitmapRenderingContext::DidRefresh()
+{
+}
+
+void
+ImageBitmapRenderingContext::MarkContextCleanForFrameCapture()
+{
+}
+
+bool
+ImageBitmapRenderingContext::IsContextCleanForFrameCapture()
+{
+  return true;
+}
+
+NS_IMPL_CYCLE_COLLECTING_ADDREF(ImageBitmapRenderingContext)
+NS_IMPL_CYCLE_COLLECTING_RELEASE(ImageBitmapRenderingContext)
+
+NS_IMPL_CYCLE_COLLECTION_WRAPPERCACHE(ImageBitmapRenderingContext,
+  mCanvasElement,
+  mOffscreenCanvas)
+
+NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(ImageBitmapRenderingContext)
+  NS_WRAPPERCACHE_INTERFACE_MAP_ENTRY
+  NS_INTERFACE_MAP_ENTRY(nsICanvasRenderingContextInternal)
+  NS_INTERFACE_MAP_ENTRY(nsISupports)
+NS_INTERFACE_MAP_END
+
+}
+}

dom/canvas/ImageBitmapRenderingContext.h

@@ -0,0 +1,97 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef ImageBitmapRenderingContext_h
+#define ImageBitmapRenderingContext_h
+
+#include "nsICanvasRenderingContextInternal.h"
+#include "nsWrapperCache.h"
+
+namespace mozilla {
+
+namespace gfx {
+class DataSourceSurface;
+class SourceSurface;
+}
+
+namespace layers {
+class Image;
+class ImageContainer;
+}
+
+namespace dom {
+
+/**
+ * The purpose of ImageBitmapRenderingContext is to provide a faster and efficient
+ * way to display ImageBitmap. Simply call TransferImageBitmap() then we'll transfer
+ * the surface of ImageBitmap to this context and then to use it to display.
+ *
+ * See more details in spec: https://wiki.whatwg.org/wiki/OffscreenCanvas
+ */
+class ImageBitmapRenderingContext final :
+  public nsICanvasRenderingContextInternal,
+  public nsWrapperCache
+{
+  virtual ~ImageBitmapRenderingContext();
+
+public:
+  ImageBitmapRenderingContext();
+
+  virtual JSObject* WrapObject(JSContext* aCx, JS::Handle<JSObject*> aGivenProto) override;
+
+  // nsISupports interface + CC
+  NS_DECL_CYCLE_COLLECTING_ISUPPORTS
+
+  NS_DECL_CYCLE_COLLECTION_SCRIPT_HOLDER_CLASS(ImageBitmapRenderingContext)
+
+  void TransferImageBitmap(ImageBitmap& aImageBitmap);
+
+  // nsICanvasRenderingContextInternal
+  virtual int32_t GetWidth() const override;
+  virtual int32_t GetHeight() const override;
+
+  NS_IMETHOD SetDimensions(int32_t aWidth, int32_t aHeight) override;
+
+  NS_IMETHOD InitializeWithSurface(nsIDocShell* aDocShell,
+                                   gfxASurface* aSurface,
+                                   int32_t aWidth,
+                                   int32_t aHeight) override;
+
+  virtual mozilla::UniquePtr<uint8_t[]> GetImageBuffer(int32_t* aFormat) override;
+  NS_IMETHOD GetInputStream(const char* aMimeType,
+                            const char16_t* aEncoderOptions,
+                            nsIInputStream** aStream) override;
+
+  virtual already_AddRefed<mozilla::gfx::SourceSurface>
+  GetSurfaceSnapshot(bool* aPremultAlpha = nullptr) override;
+
+  NS_IMETHOD SetIsOpaque(bool aIsOpaque) override;
+  virtual bool GetIsOpaque() override;
+  NS_IMETHOD Reset() override;
+  virtual already_AddRefed<Layer> GetCanvasLayer(nsDisplayListBuilder* aBuilder,
+                                                 Layer* aOldLayer,
+                                                 LayerManager* aManager) override;
+  virtual void MarkContextClean() override;
+
+  NS_IMETHOD Redraw(const gfxRect& aDirty) override;
+  NS_IMETHOD SetIsIPC(bool aIsIPC) override;
+
+  virtual void DidRefresh() override;
+
+  virtual void MarkContextCleanForFrameCapture() override;
+  virtual bool IsContextCleanForFrameCapture() override;
+
+protected:
+  already_AddRefed<gfx::DataSourceSurface> MatchWithIntrinsicSize();
+  already_AddRefed<layers::Image> ClipToIntrinsicSize();
+  int32_t mWidth;
+  int32_t mHeight;
+
+  RefPtr<layers::Image> mImage;
+};
+
+}
+}
+
+#endif /* ImageBitmapRenderingContext_h */

dom/canvas/OffscreenCanvas.cpp

@@ -8,6 +8,7 @@
 
 #include "mozilla/dom/OffscreenCanvasBinding.h"
 #include "mozilla/dom/WorkerPrivate.h"
+#include "mozilla/dom/WorkerScope.h"
 #include "mozilla/layers/AsyncCanvasRenderer.h"
 #include "mozilla/layers/CanvasClient.h"
 #include "mozilla/layers/ImageBridgeChild.h"
@@ -24,12 +25,13 @@ namespace dom {
 OffscreenCanvasCloneData::OffscreenCanvasCloneData(layers::AsyncCanvasRenderer* aRenderer,
                                                    uint32_t aWidth, uint32_t aHeight,
                                                    layers::LayersBackend aCompositorBackend,
-                                                   bool aNeutered)
+                                                   bool aNeutered, bool aIsWriteOnly)
   : mRenderer(aRenderer)
   , mWidth(aWidth)
   , mHeight(aHeight)
   , mCompositorBackendType(aCompositorBackend)
   , mNeutered(aNeutered)
+  , mIsWriteOnly(aIsWriteOnly)
 {
 }
 
@@ -37,12 +39,15 @@ OffscreenCanvasCloneData::~OffscreenCanvasCloneData()
 {
 }
 
-OffscreenCanvas::OffscreenCanvas(uint32_t aWidth,
+OffscreenCanvas::OffscreenCanvas(nsIGlobalObject* aGlobal,
+                                 uint32_t aWidth,
                                  uint32_t aHeight,
                                  layers::LayersBackend aCompositorBackend,
                                  layers::AsyncCanvasRenderer* aRenderer)
-  : mAttrDirty(false)
+  : DOMEventTargetHelper(aGlobal)
+  , mAttrDirty(false)
   , mNeutered(false)
+  , mIsWriteOnly(false)
   , mWidth(aWidth)
   , mHeight(aHeight)
   , mCompositorBackendType(aCompositorBackend)
@@ -55,12 +60,6 @@ OffscreenCanvas::~OffscreenCanvas()
   ClearResources();
 }
 
-OffscreenCanvas*
-OffscreenCanvas::GetParentObject() const
-{
-  return nullptr;
-}
-
 JSObject*
 OffscreenCanvas::WrapObject(JSContext* aCx,
                             JS::Handle<JSObject*> aGivenProto)
@@ -68,6 +67,19 @@ OffscreenCanvas::WrapObject(JSContext* aCx,
   return OffscreenCanvasBinding::Wrap(aCx, this, aGivenProto);
 }
 
+/* static */ already_AddRefed<OffscreenCanvas>
+OffscreenCanvas::Constructor(const GlobalObject& aGlobal,
+                             uint32_t aWidth,
+                             uint32_t aHeight,
+                             ErrorResult& aRv)
+{
+  nsCOMPtr<nsIGlobalObject> global = do_QueryInterface(aGlobal.GetAsSupports());
+  RefPtr<OffscreenCanvas> offscreenCanvas =
+    new OffscreenCanvas(global, aWidth, aHeight,
+                        layers::LayersBackend::LAYERS_NONE, nullptr);
+  return offscreenCanvas.forget();
+}
+
 void
 OffscreenCanvas::ClearResources()
 {
@@ -79,7 +91,9 @@ OffscreenCanvas::ClearResources()
     if (mCanvasRenderer) {
       nsCOMPtr<nsIThread> activeThread = mCanvasRenderer->GetActiveThread();
       MOZ_RELEASE_ASSERT(activeThread);
-      MOZ_RELEASE_ASSERT(activeThread == NS_GetCurrentThread());
+      bool current;
+      activeThread->IsOnCurrentThread(&current);
+      MOZ_RELEASE_ASSERT(current);
       mCanvasRenderer->SetCanvasClient(nullptr);
       mCanvasRenderer->mContext = nullptr;
       mCanvasRenderer->mGLContext = nullptr;
@@ -107,7 +121,8 @@ OffscreenCanvas::GetContext(JSContext* aCx,
   }
 
   if (!(contextType == CanvasContextType::WebGL1 ||
-        contextType == CanvasContextType::WebGL2))
+        contextType == CanvasContextType::WebGL2 ||
+        contextType == CanvasContextType::ImageBitmap))
   {
     aRv.Throw(NS_ERROR_NOT_IMPLEMENTED);
     return nullptr;
@@ -124,6 +139,8 @@ OffscreenCanvas::GetContext(JSContext* aCx,
   }
 
   if (mCanvasRenderer) {
+    if (contextType == CanvasContextType::WebGL1 ||
+        contextType == CanvasContextType::WebGL2) {
       WebGLContext* webGL = static_cast<WebGLContext*>(mCurrentContext.get());
       gl::GLContext* gl = webGL->GL();
       mCanvasRenderer->mContext = mCurrentContext;
@@ -148,6 +165,7 @@ OffscreenCanvas::GetContext(JSContext* aCx,
           screen->Morph(Move(factory));
       }
     }
+  }
 
   return result;
 }
@@ -165,6 +183,12 @@ OffscreenCanvas::CreateContext(CanvasContextType aContextType)
 void
 OffscreenCanvas::CommitFrameToCompositor()
 {
+  if (!mCanvasRenderer) {
+    // This offscreen canvas doesn't associate to any HTML canvas element.
+    // So, just bail out.
+    return;
+  }
+
   // The attributes has changed, we have to notify main
   // thread to change canvas size.
   if (mAttrDirty) {
@@ -191,15 +215,121 @@ OffscreenCanvasCloneData*
 OffscreenCanvas::ToCloneData()
 {
   return new OffscreenCanvasCloneData(mCanvasRenderer, mWidth, mHeight,
-                                      mCompositorBackendType, mNeutered);
+                                      mCompositorBackendType, mNeutered, mIsWriteOnly);
+}
+
+already_AddRefed<ImageBitmap>
+OffscreenCanvas::TransferToImageBitmap()
+{
+  ErrorResult rv;
+  RefPtr<ImageBitmap> result = ImageBitmap::CreateFromOffscreenCanvas(GetGlobalObject(), *this, rv);
+
+  // Clear the content.
+  if ((mCurrentContextType == CanvasContextType::WebGL1 ||
+       mCurrentContextType == CanvasContextType::WebGL2))
+  {
+    WebGLContext* webGL = static_cast<WebGLContext*>(mCurrentContext.get());
+    webGL->ClearScreen();
+  }
+
+  return result.forget();
+}
+
+already_AddRefed<Promise>
+OffscreenCanvas::ToBlob(JSContext* aCx,
+                        const nsAString& aType,
+                        JS::Handle<JS::Value> aParams,
+                        ErrorResult& aRv)
+{
+  // do a trust check if this is a write-only canvas
+  if (mIsWriteOnly) {
+    aRv.Throw(NS_ERROR_DOM_SECURITY_ERR);
+    return nullptr;
+  }
+
+  nsCOMPtr<nsIGlobalObject> global = GetGlobalObject();
+
+  RefPtr<Promise> promise = Promise::Create(global, aRv);
+  if (aRv.Failed()) {
+    return nullptr;
+  }
+
+  // Encoder callback when encoding is complete.
+  class EncodeCallback : public EncodeCompleteCallback
+  {
+  public:
+    EncodeCallback(nsIGlobalObject* aGlobal, Promise* aPromise)
+      : mGlobal(aGlobal)
+      , mPromise(aPromise) {}
+
+    // This is called on main thread.
+    nsresult ReceiveBlob(already_AddRefed<Blob> aBlob)
+    {
+      RefPtr<Blob> blob = aBlob;
+
+      ErrorResult rv;
+      uint64_t size = blob->GetSize(rv);
+      if (rv.Failed()) {
+        rv.SuppressException();
+      } else {
+        AutoJSAPI jsapi;
+        if (jsapi.Init(mGlobal)) {
+          JS_updateMallocCounter(jsapi.cx(), size);
+        }
+      }
+
+      if (mPromise) {
+        RefPtr<Blob> newBlob = Blob::Create(mGlobal, blob->Impl());
+        mPromise->MaybeResolve(newBlob);
+      }
+
+      mGlobal = nullptr;
+      mPromise = nullptr;
+
+      return rv.StealNSResult();
+    }
+
+    nsCOMPtr<nsIGlobalObject> mGlobal;
+    RefPtr<Promise> mPromise;
+  };
+
+  RefPtr<EncodeCompleteCallback> callback =
+    new EncodeCallback(global, promise);
+
+  CanvasRenderingContextHelper::ToBlob(aCx, global,
+                                       callback, aType, aParams, aRv);
+
+  return promise.forget();
+}
+
+already_AddRefed<gfx::SourceSurface>
+OffscreenCanvas::GetSurfaceSnapshot(bool* aPremultAlpha)
+{
+  if (!mCurrentContext) {
+    return nullptr;
+  }
+
+  return mCurrentContext->GetSurfaceSnapshot(aPremultAlpha);
+}
+
+nsCOMPtr<nsIGlobalObject>
+OffscreenCanvas::GetGlobalObject()
+{
+  if (NS_IsMainThread()) {
+    return GetParentObject();
+  }
+
+  dom::workers::WorkerPrivate* workerPrivate =
+    dom::workers::GetCurrentThreadWorkerPrivate();
+  return workerPrivate->GlobalScope();
 }
 
 /* static */ already_AddRefed<OffscreenCanvas>
-OffscreenCanvas::CreateFromCloneData(OffscreenCanvasCloneData* aData)
+OffscreenCanvas::CreateFromCloneData(nsIGlobalObject* aGlobal, OffscreenCanvasCloneData* aData)
 {
   MOZ_ASSERT(aData);
   RefPtr<OffscreenCanvas> wc =
-    new OffscreenCanvas(aData->mWidth, aData->mHeight,
+    new OffscreenCanvas(aGlobal, aData->mWidth, aData->mHeight,
                         aData->mCompositorBackendType, aData->mRenderer);
   if (aData->mNeutered) {
     wc->SetNeutered();

dom/canvas/OffscreenCanvas.h

@@ -25,6 +25,8 @@ class CanvasClient;
 } // namespace layers
 
 namespace dom {
+class Blob;
+class ImageBitmap;
 
 // This is helper class for transferring OffscreenCanvas to worker thread.
 // Because OffscreenCanvas is not thread-safe. So we cannot pass Offscreen-
@@ -35,7 +37,7 @@ struct OffscreenCanvasCloneData final
   OffscreenCanvasCloneData(layers::AsyncCanvasRenderer* aRenderer,
                            uint32_t aWidth, uint32_t aHeight,
                            layers::LayersBackend aCompositorBackend,
-                           bool aNeutered);
+                           bool aNeutered, bool aIsWriteOnly);
   ~OffscreenCanvasCloneData();
 
   RefPtr<layers::AsyncCanvasRenderer> mRenderer;
@@ -43,6 +45,7 @@ struct OffscreenCanvasCloneData final
   uint32_t mHeight;
   layers::LayersBackend mCompositorBackendType;
   bool mNeutered;
+  bool mIsWriteOnly;
 };
 
 class OffscreenCanvas final : public DOMEventTargetHelper
@@ -52,16 +55,23 @@ public:
   NS_DECL_ISUPPORTS_INHERITED
   NS_DECL_CYCLE_COLLECTION_CLASS_INHERITED(OffscreenCanvas, DOMEventTargetHelper)
 
-  OffscreenCanvas(uint32_t aWidth,
+  OffscreenCanvas(nsIGlobalObject* aGlobal,
+                  uint32_t aWidth,
                   uint32_t aHeight,
                   layers::LayersBackend aCompositorBackend,
                   layers::AsyncCanvasRenderer* aRenderer);
 
-  OffscreenCanvas* GetParentObject() const;
+  nsCOMPtr<nsIGlobalObject> GetParentObject() const { return GetOwnerGlobal(); }
 
   virtual JSObject* WrapObject(JSContext* aCx,
                                JS::Handle<JSObject*> aGivenProto) override;
 
+  static already_AddRefed<OffscreenCanvas>
+  Constructor(const GlobalObject& aGlobal,
+              uint32_t aWidth,
+              uint32_t aHeight,
+              ErrorResult& aRv);
+
   void ClearResources();
 
   uint32_t Width() const
@@ -100,13 +110,24 @@ public:
     }
   }
 
+  already_AddRefed<ImageBitmap>
+  TransferToImageBitmap();
+
+  already_AddRefed<Promise>
+  ToBlob(JSContext* aCx,
+         const nsAString& aType,
+         JS::Handle<JS::Value> aParams,
+         ErrorResult& aRv);
+
   nsICanvasRenderingContextInternal* GetContext() const
   {
     return mCurrentContext;
   }
 
+  already_AddRefed<gfx::SourceSurface> GetSurfaceSnapshot(bool* aPremultAlpha = nullptr);
+
   static already_AddRefed<OffscreenCanvas>
-  CreateFromCloneData(OffscreenCanvasCloneData* aData);
+  CreateFromCloneData(nsIGlobalObject* aGlobal, OffscreenCanvasCloneData* aData);
 
   static bool PrefEnabled(JSContext* aCx, JSObject* aObj);
 
@@ -147,6 +168,16 @@ public:
     return mNeutered;
   }
 
+  void SetWriteOnly()
+  {
+    mIsWriteOnly = true;
+  }
+
+  bool IsWriteOnly() const
+  {
+    return mIsWriteOnly;
+  }
+
   layers::LayersBackend GetCompositorBackendType() const
   {
     return mCompositorBackendType;
@@ -155,6 +186,8 @@ public:
 private:
   ~OffscreenCanvas();
 
+  nsCOMPtr<nsIGlobalObject> GetGlobalObject();
+
   void CanvasAttrChanged()
   {
     mAttrDirty = true;
@@ -164,6 +197,7 @@ private:
 
   bool mAttrDirty;
   bool mNeutered;
+  bool mIsWriteOnly;
 
   uint32_t mWidth;
   uint32_t mHeight;

dom/canvas/WebGL2Context.cpp

@@ -5,10 +5,10 @@
 
 #include "WebGL2Context.h"
 
+#include "gfxPrefs.h"
 #include "GLContext.h"
 #include "mozilla/dom/WebGL2RenderingContextBinding.h"
 #include "mozilla/ArrayUtils.h"
-#include "mozilla/Preferences.h"
 #include "mozilla/Telemetry.h"
 #include "WebGLBuffer.h"
 #include "WebGLFormats.h"
@@ -37,7 +37,7 @@ WebGL2Context::CreateFormatUsage(gl::GLContext* gl) const
 /*static*/ bool
 WebGL2Context::IsSupported()
 {
-    return Preferences::GetBool("webgl.enable-prototype-webgl2", false);
+    return gfxPrefs::WebGL2Enabled();
 }
 
 /*static*/ WebGL2Context*

dom/canvas/WebGLContext.cpp

@@ -1131,9 +1131,9 @@ private:
     RefPtr<HTMLCanvasElement> mCanvas;
 };
 
-already_AddRefed<layers::CanvasLayer>
+already_AddRefed<layers::Layer>
 WebGLContext::GetCanvasLayer(nsDisplayListBuilder* builder,
-                             CanvasLayer* oldLayer,
+                             Layer* oldLayer,
                              LayerManager* manager)
 {
     if (IsContextLost())
@@ -1141,7 +1141,7 @@ WebGLContext::GetCanvasLayer(nsDisplayListBuilder* builder,
 
     if (!mResetLayer && oldLayer &&
         oldLayer->HasUserData(&gWebGLLayerUserData)) {
-        RefPtr<layers::CanvasLayer> ret = oldLayer;
+        RefPtr<layers::Layer> ret = oldLayer;
         return ret.forget();
     }
 

dom/canvas/WebGLContext.h

@@ -331,8 +331,8 @@ public:
         return ActiveBoundTextureForTarget(texTarget);
     }
 
-    already_AddRefed<CanvasLayer>
-    GetCanvasLayer(nsDisplayListBuilder* builder, CanvasLayer* oldLayer,
+    already_AddRefed<Layer>
+    GetCanvasLayer(nsDisplayListBuilder* builder, Layer* oldLayer,
                    LayerManager* manager) override;
 
     // Note that 'clean' here refers to its invalidation state, not the

dom/canvas/WebGLFormats.cpp

@@ -542,9 +542,12 @@ FormatUsageAuthority::CreateForWebGL1(gl::GLContext* gl)
     fnSet(EffectiveFormat::RGBA8  , true, true);
     fnSet(EffectiveFormat::RGBA4  , true, true);
     fnSet(EffectiveFormat::RGB5_A1, true, true);
-    fnSet(EffectiveFormat::RGB8   , false, true);
     fnSet(EffectiveFormat::RGB565 , true, true);
 
+    // RGB8 is not guaranteed to be renderable, but we should allow it for web-compat.
+    // Min-capability mode should mark this as non-renderable.
+    fnSet(EffectiveFormat::RGB8, true, true);
+
     fnSet(EffectiveFormat::Luminance8Alpha8, false, true);
     fnSet(EffectiveFormat::Luminance8      , false, true);
     fnSet(EffectiveFormat::Alpha8          , false, true);

dom/canvas/moz.build

@@ -7,7 +7,7 @@
 TEST_DIRS += ['compiledtest']
 
 # Number changes to this file to avoid bug 1081323 (clobber after changing a manifest):
-# 1
+# 2
 
 MOCHITEST_MANIFESTS += [
     'test/crossorigin/mochitest.ini',
@@ -34,6 +34,7 @@ EXPORTS.mozilla.dom += [
     'CanvasRenderingContextHelper.h',
     'CanvasUtils.h',
     'ImageBitmap.h',
+    'ImageBitmapRenderingContext.h',
     'ImageBitmapSource.h',
     'ImageData.h',
     'OffscreenCanvas.h',
@@ -50,6 +51,7 @@ UNIFIED_SOURCES += [
     'DocumentRendererChild.cpp',
     'DocumentRendererParent.cpp',
     'ImageBitmap.cpp',
+    'ImageBitmapRenderingContext.cpp',
     'ImageData.cpp',
     'OffscreenCanvas.cpp',
 ]

dom/canvas/nsICanvasRenderingContextInternal.h

@@ -26,6 +26,7 @@ class nsDisplayListBuilder;
 namespace mozilla {
 namespace layers {
 class CanvasLayer;
+class Layer;
 class LayerManager;
 } // namespace layers
 namespace gfx {
@@ -39,6 +40,7 @@ class nsICanvasRenderingContextInternal :
 {
 public:
   typedef mozilla::layers::CanvasLayer CanvasLayer;
+  typedef mozilla::layers::Layer Layer;
   typedef mozilla::layers::LayerManager LayerManager;
 
   NS_DECLARE_STATIC_IID_ACCESSOR(NS_ICANVASRENDERINGCONTEXTINTERNAL_IID)
@@ -129,8 +131,8 @@ public:
 
   // Return the CanvasLayer for this context, creating
   // one for the given layer manager if not available.
-  virtual already_AddRefed<CanvasLayer> GetCanvasLayer(nsDisplayListBuilder* builder,
-                                                       CanvasLayer *oldLayer,
+  virtual already_AddRefed<Layer> GetCanvasLayer(nsDisplayListBuilder* builder,
+                                                 Layer *oldLayer,
                                                  LayerManager *manager) = 0;
 
   // Return true if the canvas should be forced to be "inactive" to ensure

dom/canvas/test/mochitest.ini

@@ -218,6 +218,7 @@ skip-if = toolkit != 'cocoa'
 [test_2d.path.rect.zero.6.html]
 disabled = bug 407107
 [test_2d.strokeRect.zero.5.html]
+[test_bitmaprenderer.html]
 [test_bug232227.html]
 [test_bug613794.html]
 [test_bug753758.html]
@@ -246,11 +247,13 @@ support-files = captureStream_common.js
 support-files = file_drawWindow_source.html file_drawWindow_common.js
 skip-if = (buildapp == 'b2g' && toolkit != 'gonk')
 [test_imagebitmap.html]
+[test_imagebitmap_close.html]
 [test_imagebitmap_cropping.html]
 [test_imagebitmap_on_worker.html]
 [test_imagebitmap_structuredclone.html]
 [test_imagebitmap_structuredclone_iframe.html]
 [test_imagebitmap_structuredclone_window.html]
+[test_imagebitmap_transfer.html]
 [test_ImageData_ctor.html]
 [test_isPointInStroke.html]
 [test_mozDashOffset.html]
@@ -267,6 +270,10 @@ skip-if = (buildapp == 'b2g' && toolkit != 'gonk') # bug 1040965
 [test_createPattern_broken.html]
 [test_setlinedash.html]
 [test_filter.html]
+[test_offscreencanvas_toblob.html]
+tags = offscreencanvas
+[test_offscreencanvas_toimagebitmap.html]
+tags = offscreencanvas
 [test_offscreencanvas_basic_webgl.html]
 tags = offscreencanvas
 [test_offscreencanvas_dynamic_fallback.html]

dom/canvas/test/offscreencanvas.js

@@ -1,27 +1,49 @@
 /* WebWorker for test_offscreencanvas_*.html */
+(function(){
+
 var port = null;
 
-function ok(expect, msg) {
-  if (port) {
-    port.postMessage({type: "test", result: !!expect, name: msg});
-  } else {
-    postMessage({type: "test", result: !!expect, name: msg});
+function isInWorker() {
+  try {
+    return !(self instanceof Window);
+  } catch (e) {
+    return true;
   }
 }
 
+function postMessageGeneral(data) {
+  if (isInWorker()) {
+    if (port) {
+      port.postMessage(data);
+    } else {
+      postMessage(data);
+    }
+  } else {
+    postMessage(data, "*");
+  }
+}
+
+function ok(expect, msg) {
+  postMessageGeneral({type: "test", result: !!expect, name: msg});
+}
+
 function finish() {
-  if (port) {
-    port.postMessage({type: "finish"});
-  } else {
-    postMessage({type: "finish"});
-  }
+  postMessageGeneral({type: "finish"});
 }
 
 function drawCount(count) {
+  postMessageGeneral({type: "draw", count: count});
+}
+
+function sendBlob(blob) {
+  postMessageGeneral({type: "blob", blob: blob});
+}
+
+function sendImageBitmap(img) {
   if (port) {
-    port.postMessage({type: "draw", count: count});
+    port.postMessage({type: "imagebitmap", bitmap: img});
   } else {
-    postMessage({type: "draw", count: count});
+    postMessage({type: "imagebitmap", bitmap: img});
   }
 }
 
@@ -140,7 +162,7 @@ function createDrawFunc(canvas) {
   // Start drawing
   checkGLError('after setup');
 
-  return function(prefix) {
+  return function(prefix, needCommitFrame) {
     if (prefix) {
       prefix = "[" + prefix + "] ";
     } else {
@@ -152,7 +174,9 @@ function createDrawFunc(canvas) {
     preDraw(prefix);
     gl.drawArrays(gl.TRIANGLE_STRIP, 0, 4);
     postDraw(prefix);
+    if (needCommitFrame) {
       gl.commit();
+    }
     checkGLError(prefix);
   };
 }
@@ -161,6 +185,9 @@ function createDrawFunc(canvas) {
 function entryFunction(testStr, subtests, offscreenCanvas) {
   var test = testStr;
   var canvas = offscreenCanvas;
+  if (test == "webgl_imagebitmap") {
+    canvas = new OffscreenCanvas(64, 64);
+  }
 
   if (test != "subworker") {
     ok(canvas, "Canvas successfully transfered to worker");
@@ -190,7 +217,7 @@ function entryFunction(testStr, subtests, offscreenCanvas) {
         finish();
         return;
       }
-      draw("loop " +count);
+      draw("loop " +count, true);
     }, 0);
   }
   //------------------------------------------------------------------------
@@ -205,11 +232,38 @@ function entryFunction(testStr, subtests, offscreenCanvas) {
     var count = 0;
     var iid = setInterval(function() {
       ++count;
-      draw("loop " + count);
+      draw("loop " + count, true);
       drawCount(count);
     }, 0);
   }
   //------------------------------------------------------------------------
+  // Test toBlob
+  //------------------------------------------------------------------------
+  else if (test == "webgl_toblob") {
+    draw = createDrawFunc(canvas);
+    if (!draw) {
+      return;
+    }
+
+    draw("", false);
+    canvas.toBlob().then(function(blob) {
+      sendBlob(blob);
+    });
+  }
+  //------------------------------------------------------------------------
+  // Test toImageBitmap
+  //------------------------------------------------------------------------
+  else if (test == "webgl_imagebitmap") {
+    draw = createDrawFunc(canvas);
+    if (!draw) {
+      return;
+    }
+
+    draw("", false);
+    var imgBitmap = canvas.transferToImageBitmap();
+    sendImageBitmap(imgBitmap);
+  }
+  //------------------------------------------------------------------------
   // Canvas Size Change from Worker
   //------------------------------------------------------------------------
   else if (test == "webgl_changesize") {
@@ -219,22 +273,22 @@ function entryFunction(testStr, subtests, offscreenCanvas) {
       return;
     }
 
-    draw("64x64");
+    draw("64x64", true);
 
     setTimeout(function() {
       canvas.width = 128;
       canvas.height = 128;
-      draw("Increased to 128x128");
+      draw("Increased to 128x128", true);
 
       setTimeout(function() {
         canvas.width = 32;
         canvas.width = 32;
-        draw("Decreased to 32x32");
+        draw("Decreased to 32x32", true);
 
         setTimeout(function() {
           canvas.width = 64;
           canvas.height = 64;
-          draw("Increased to 64x64");
+          draw("Increased to 64x64", true);
 
           ok(true, "Worker is done");
           finish();
@@ -297,3 +351,9 @@ onconnect = function(evt) {
 
   port.start();
 };
+
+if (!isInWorker()) {
+  window.entryFunction = entryFunction;
+}
+
+})();

dom/canvas/test/test_bitmaprenderer.html

@@ -0,0 +1,163 @@
+<!DOCTYPE HTML>
+<html>
+<head>
+<title>WebGL in OffscreenCanvas</title>
+<script src="/tests/SimpleTest/SimpleTest.js"></script>
+<script src="/tests/SimpleTest/WindowSnapshot.js"></script>
+<link rel="stylesheet" href="/tests/SimpleTest/test.css">
+</head>
+<body>
+<script type="text/js-worker">
+function ok(expect, msg) {
+  postMessage({"type": "status", status: !!expect, msg: msg});
+}
+
+onmessage = function(event) {
+  var bitmap = event.data.bitmap;
+  ok(!!bitmap, "Get the ImageBitmap from the main script.");
+
+  var offscreenCanvas = new OffscreenCanvas(64, 64);
+  var ctx = offscreenCanvas.getContext('bitmaprenderer');
+  ok(!!ctx, "Get bitmaprenderer context on worker.");
+
+  ctx.transferImageBitmap(bitmap);
+  var resultBitmap = offscreenCanvas.transferToImageBitmap();
+  postMessage({"type": "bitmap", bitmap: resultBitmap}, [resultBitmap]);
+}
+</script>
+<script>
+
+SimpleTest.waitForExplicitFinish();
+
+function createCanvas(width, height) {
+  var htmlCanvas = document.createElement('canvas');
+  htmlCanvas.width = width;
+  htmlCanvas.height = height;
+  document.body.appendChild(htmlCanvas);
+  return htmlCanvas;
+}
+
+function runTest(canvasWidth, canvasHeight, nextTest) {
+  var canvas1 = createCanvas(canvasWidth, canvasHeight);
+  var ctx = canvas1.getContext("2d");
+  ctx.fillStyle = "#00FF00";
+  ctx.fillRect(0, 0, canvasWidth, canvasHeight);
+
+  var canvasRef = createCanvas(90, 90);
+  var ctx = canvasRef.getContext("2d");
+  // Clear with black transparent first
+  ctx.fillStyle = "rgba(0, 0, 0, 0)";
+  ctx.fillRect(0, 0, 90, 90);
+
+  ctx.fillStyle = "#00FF00";
+  ctx.fillRect(0, 0, canvasWidth, canvasHeight);
+
+  createImageBitmap(canvas1).then(function(bmp) {
+    document.body.removeChild(canvas1);
+
+    var canvas2 = createCanvas(90, 90);
+    var ctx2 = canvas2.getContext("bitmaprenderer");
+    ctx2.transferImageBitmap(bmp);
+
+    ok(canvasRef.toDataURL() == canvas2.toDataURL(), "toDataURL should return same result.");
+
+    // Exam render result
+    canvasRef.style.display = "none";
+    canvas2.style.display = "block";
+    var snapshot = snapshotWindow(window);
+
+    canvasRef.style.display = "block";
+    canvas2.style.display = "none";
+    var snapshotRef = snapshotWindow(window);
+
+    var results = compareSnapshots(snapshot, snapshotRef, true);
+    ok(results[0], "Screenshots should be the same");
+
+    document.body.removeChild(canvasRef);
+    document.body.removeChild(canvas2);
+
+    nextTest();
+  });
+}
+
+function scaleTest() {
+  var canvas1 = createCanvas(64, 64);
+  var ctx = canvas1.getContext("2d");
+  ctx.fillStyle = "#00FF00";
+  ctx.fillRect(0, 0, 64, 64);
+
+  var canvas2 = createCanvas(64, 64);
+  var ctx2 = canvas2.getContext("2d");
+  ctx2.fillStyle = "#00FF00";
+  ctx2.fillRect(0, 0, 64, 64);
+
+  var p1 = createImageBitmap(canvas1);
+  var p2 = createImageBitmap(canvas2);
+  Promise.all([p1, p2]).then(function(bitmaps) {
+    document.body.removeChild(canvas1);
+    document.body.removeChild(canvas2);
+
+    // Create a large canvas then shrink.
+    var canvas3 = createCanvas(128, 128);
+    var ctx3 = canvas3.getContext("bitmaprenderer");
+    ctx3.transferImageBitmap(bitmaps[0]);
+    var snapshotLargeRef = snapshotWindow(window);
+
+    canvas3.width = 32;
+    canvas3.height = 32;
+    var snapshotSmall = snapshotWindow(window);
+    document.body.removeChild(canvas3);
+
+    // Create a small canvas then grow.
+    var canvas4 = createCanvas(32, 32);
+    var ctx4 = canvas4.getContext("bitmaprenderer");
+    ctx4.transferImageBitmap(bitmaps[1]);
+    var snapshotSmallRef = snapshotWindow(window);
+
+    canvas4.width = 128;
+    canvas4.height = 128;
+    var snapshotLarge = snapshotWindow(window);
+    document.body.removeChild(canvas4);
+
+    var resultsLarge = compareSnapshots(snapshotLarge, snapshotLargeRef, true);
+    ok(resultsLarge[0], "Screenshots should be the same");
+
+    var resultsSmall = compareSnapshots(snapshotSmall, snapshotSmallRef, true);
+    ok(resultsSmall[0], "Screenshots should be the same");
+    runTestOnWorker();
+  });
+}
+
+function runTestOnWorker() {
+  var canvas1 = createCanvas(64, 64);
+  var ctx = canvas1.getContext("2d");
+  ctx.fillStyle = "#00FF00";
+  ctx.fillRect(0, 0, 64, 64);
+
+  var blob = new Blob(Array.prototype.map.call(document.querySelectorAll("script[type=\"text\/js-worker\"]"), function (oScript) { return oScript.textContent; }),{type: "text/javascript"});
+
+  var worker = new Worker(window.URL.createObjectURL(blob));
+
+  createImageBitmap(canvas1).then(function(bmp) {
+    worker.postMessage({bitmap: bmp}, [bmp]);
+    worker.onmessage = function(event) {
+      if (event.data.type == "status") {
+        ok(event.data.status, event.data.msg);
+      } else if (event.data.type == "bitmap") {
+        var canvas2 = createCanvas(64, 64);
+        var ctx2 = canvas2.getContext('bitmaprenderer');
+        ctx2.transferImageBitmap(event.data.bitmap);
+        ok(canvas1.toDataURL() == canvas2.toDataURL(), 'toDataURL should be the same');
+        SimpleTest.finish();
+      }
+    }
+  });
+}
+
+SpecialPowers.pushPrefEnv({'set': [
+  ['gfx.offscreencanvas.enabled', true],
+]}, runTest.bind(this, 64, 64, runTest.bind(this, 128, 128, scaleTest)));
+
+</script>
+</body>
+</html>

dom/canvas/test/test_imagebitmap_close.html

@@ -0,0 +1,93 @@
+<!DOCTYPE HTML>
+<html>
+<head>
+<title>WebGL in OffscreenCanvas</title>
+<script src="/tests/SimpleTest/SimpleTest.js"></script>
+<script src="/tests/SimpleTest/WindowSnapshot.js"></script>
+<link rel="stylesheet" href="/tests/SimpleTest/test.css">
+</head>
+<body>
+<script type="text/js-worker">
+function ok(expect, msg) {
+  postMessage({"type": "status", status: !!expect, msg: msg});
+}
+
+onmessage = function(event) {
+  var bitmap = event.data.bitmap;
+  ok(!!bitmap, "Get the ImageBitmap from the main script.");
+  bitmap.close();
+  ok(bitmap.width == 0 && bitmap.height == 0, "After close(), width and height should return 0");
+  postMessage({"type": "finish"});
+}
+</script>
+<script>
+
+SimpleTest.waitForExplicitFinish();
+
+function createCanvas() {
+  var htmlCanvas = document.createElement('canvas');
+  htmlCanvas.width = 64;
+  htmlCanvas.height = 64;
+  document.body.appendChild(htmlCanvas);
+  return htmlCanvas;
+}
+
+function runTest() {
+  var canvas1 = createCanvas();
+  var ctx = canvas1.getContext("2d");
+  ctx.fillStyle = "#00FF00";
+  ctx.fillRect(0, 0, 64, 64);
+
+  var canvasRef = createCanvas();
+  var ctx = canvasRef.getContext("2d");
+  ctx.fillStyle = "#00FF00";
+  ctx.fillRect(0, 0, 64, 64);
+
+  createImageBitmap(canvas1).then(function(bmp) {
+    var canvas2 = createCanvas();
+    var ctx2 = canvas2.getContext("2d");
+    ctx2.drawImage(bmp, 0, 0);
+
+    ok(canvasRef.toDataURL() == canvas2.toDataURL(), "toDataURL should return same result.");
+    document.body.removeChild(canvas2);
+
+    bmp.close();
+    ok(bmp.width == 0 && bmp.height == 0, "After close(), width and height should return 0");
+    var canvas2 = createCanvas();
+    var ctx2 = canvas2.getContext("2d");
+    var beforeDrawImageDataURL = canvas2.toDataURL();
+    ctx2.drawImage(bmp, 0, 0);
+    var afterDrawImageDataURL = canvas2.toDataURL();
+    ok(beforeDrawImageDataURL == afterDrawImageDataURL,
+       "Drawing operations with a closed ImageBitmap should do nothing.");
+    runTestOnWorker();
+  });
+}
+
+function runTestOnWorker() {
+  var canvas1 = createCanvas();
+  var ctx = canvas1.getContext("2d");
+  ctx.fillStyle = "#00FF00";
+  ctx.fillRect(0, 0, 64, 64);
+
+  var blob = new Blob(Array.prototype.map.call(document.querySelectorAll("script[type=\"text\/js-worker\"]"), function (oScript) { return oScript.textContent; }),{type: "text/javascript"});
+
+  var worker = new Worker(window.URL.createObjectURL(blob));
+
+  createImageBitmap(canvas1).then(function(bmp) {
+    worker.postMessage({bitmap: bmp}, [bmp]);
+    worker.onmessage = function(event) {
+      if (event.data.type == "status") {
+        ok(event.data.status, event.data.msg);
+      } else if (event.data.type == "finish") {
+        SimpleTest.finish();
+      }
+    }
+  });
+}
+
+runTest();
+
+</script>
+</body>
+</html>

dom/canvas/test/test_imagebitmap_transfer.html

@@ -0,0 +1,111 @@
+<!DOCTYPE HTML>
+<title>Test ImageBitmap : Transfer</title>
+<meta charset="utf-8">
+<script src="/tests/SimpleTest/SimpleTest.js"></script>
+<link rel="stylesheet" href="/tests/SimpleTest/test.css">
+<body>
+<script type="text/javascript">
+
+var gImage1;
+var gImage2;
+var gImageBitmap1;
+var gImageBitmap2;
+
+function isPixel(ctx1, ctx2, x, y) {
+  var pixel1 = ctx1.getImageData(x, y, 1, 1);
+  var pixel2 = ctx2.getImageData(x, y, 1, 1);
+  ok(pixel1.data[0] == pixel2.data[0] &&
+     pixel1.data[1] == pixel2.data[1] &&
+     pixel1.data[2] == pixel2.data[2] &&
+     pixel1.data[3] == pixel2.data[3],
+    "Color(" + pixel1.data[0] + ", " + pixel1.data[1] + ", " + pixel1.data[2] + ", " + pixel1.data[3] + ") should qual to Color(" + pixel2.data[0] + ", " + pixel2.data[1] + ", " + pixel2.data[2] + ", " + pixel2.data[3] +  ")");
+}
+
+function compareImageBitmapWithImageElement(imageBitmap, imageElement) {
+  var canvas1 = document.createElement('canvas');
+  var canvas2 = document.createElement('canvas');
+
+  canvas1.width  = imageElement.naturalWidth;
+  canvas1.height = imageElement.naturalHeight;
+  canvas2.width  = imageElement.naturalWidth;
+  canvas2.height = imageElement.naturalHeight;
+
+  var ctx1 = canvas1.getContext('2d');
+  var ctx2 = canvas2.getContext('2d');
+
+  ctx1.drawImage(imageElement, 0, 0);
+  ctx2.drawImage(imageBitmap, 0, 0);
+
+  document.body.appendChild(canvas1);
+  document.body.appendChild(canvas2);
+
+  for (var t = 0; t < 20; ++t) {
+    // check one random pixel
+    var randomX = Math.floor(Math.random() * imageElement.naturalWidth);
+    var randomY = Math.floor(Math.random() * imageElement.naturalHeight);
+    isPixel(ctx1, ctx2, randomX, randomY);
+  }
+}
+
+var worker = new Worker("imagebitmap_structuredclone.js");
+worker.onmessage = function(event) {
+
+  if (event.data.type == "status") {
+    ok(event.data.status, event.data.msg);
+  } else if (event.data.type == "finish") {
+    SimpleTest.finish();
+  } else if (event.data.type == "bitmap1") {
+    compareImageBitmapWithImageElement(event.data.bitmap, gImage1);
+  } else if (event.data.type == "bitmap2") {
+    compareImageBitmapWithImageElement(event.data.bitmap, gImage2);
+  }
+}
+
+function prepareTwoImageBitmap() {
+  gImage1 = document.createElement('img');
+  gImage2 = document.createElement('img');
+  gImage1.src = "image_rgrg-256x256.png";
+  gImage2.src = "image_yellow.png";
+
+  var p1 = new Promise(function(resolve, reject) {
+    gImage1.onload = function() {
+      var promise = createImageBitmap(gImage1);
+      promise.then(function(bitmap) {
+        gImageBitmap1 = bitmap;
+        resolve(true);
+      });
+    }
+  });
+
+  var p2 = new Promise(function(resolve, reject) {
+    gImage2.onload = function() {
+      var promise = createImageBitmap(gImage2);
+      promise.then(function(bitmap) {
+        gImageBitmap2 = bitmap;
+        resolve(true);
+      });
+    }
+  });
+
+  return Promise.all([p1, p2]);
+}
+
+function runTests() {
+  ok(worker, "Worker created successfully.");
+
+  prepareTwoImageBitmap().then(function(){
+    worker.postMessage({"bitmap1":gImageBitmap1, "bitmap2":gImageBitmap2},
+                       [gImageBitmap1, gImageBitmap2]);
+
+    ok(gImageBitmap1.width == 0 && gImageBitmap1.height == 0,
+       "After transfer, ImageBitmap become neutered");
+    ok(gImageBitmap2.width == 0 && gImageBitmap2.height == 0,
+       "After transfer, ImageBitmap become neutered");
+  });
+}
+
+SimpleTest.waitForExplicitFinish();
+addLoadEvent(runTests);
+
+</script>
+</body>

dom/canvas/test/test_offscreencanvas_toblob.html

@@ -0,0 +1,91 @@
+<!DOCTYPE HTML>
+<html>
+<head>
+<title>WebGL in OffscreenCanvas</title>
+<script src="/tests/SimpleTest/SimpleTest.js"></script>
+<script src="offscreencanvas.js"></script>
+<link rel="stylesheet" href="/tests/SimpleTest/test.css">
+</head>
+<body>
+<canvas id="c" width="64" height="64"></canvas>
+<canvas id="c-mt" width="64" height="64"></canvas>
+<canvas id="c-ref" width="64" height="64"></canvas>
+<script>
+
+SimpleTest.waitForExplicitFinish();
+
+function testBlob(blob, callback) {
+  // testing toBlob
+  // Fill c-ref with green color.
+  var c = document.getElementById("c-ref");
+  var ctx = c.getContext("2d");
+  ctx.rect(0, 0, 64, 64);
+  ctx.fillStyle = "#00FF00";
+  ctx.fill();
+  var reader = new FileReader();
+  reader.onload = function(e) {
+    ok(c.toDataURL() == e.target.result, "toBlob should return a 64x64 green square");
+    callback();
+  };
+  reader.readAsDataURL(blob);
+}
+
+function runTestOnMainThread() {
+  var htmlCanvas = document.getElementById("c-mt");
+  ok(htmlCanvas, "Should have HTML canvas element");
+
+  window.onmessage = function(evt) {
+    var msg = evt.data || {};
+    if (msg.type == "test") {
+      ok(msg.result, msg.name);
+    }
+    if (msg.type == "blob") {
+      testBlob(msg.blob, SimpleTest.finish);
+    }
+  }
+
+  ok(htmlCanvas.transferControlToOffscreen, "HTMLCanvasElement has transferControlToOffscreen function");
+
+  var offscreenCanvas = htmlCanvas.transferControlToOffscreen();
+  ok(offscreenCanvas, "Expected transferControlToOffscreen to succeed");
+
+  entryFunction('webgl_toblob', '', offscreenCanvas);
+}
+
+function runTest() {
+
+  var htmlCanvas = document.getElementById("c");
+  var worker = new Worker("offscreencanvas.js");
+
+  ok(htmlCanvas, "Should have HTML canvas element");
+  ok(worker, "Web worker successfully created");
+
+  worker.onmessage = function(evt) {
+    var msg = evt.data || {};
+    if (msg.type == "test") {
+      ok(msg.result, msg.name);
+    }
+    if (msg.type == "blob") {
+      testBlob(msg.blob, function() {
+        worker.terminate();
+        runTestOnMainThread();
+      });
+    }
+  }
+
+  ok(htmlCanvas.transferControlToOffscreen, "HTMLCanvasElement has transferControlToOffscreen function");
+
+  var offscreenCanvas = htmlCanvas.transferControlToOffscreen();
+  ok(offscreenCanvas, "Expected transferControlToOffscreen to succeed");
+
+  worker.postMessage({test: 'webgl_toblob', canvas: offscreenCanvas}, [offscreenCanvas]);
+}
+
+SpecialPowers.pushPrefEnv({'set': [
+  ['gfx.offscreencanvas.enabled', true],
+  ['webgl.force-enabled', true],
+]}, runTest);
+
+</script>
+</body>
+</html>

dom/canvas/test/test_offscreencanvas_toimagebitmap.html

@@ -0,0 +1,69 @@
+<!DOCTYPE HTML>
+<html>
+<head>
+<title>WebGL in OffscreenCanvas</title>
+<script src="/tests/SimpleTest/SimpleTest.js"></script>
+<link rel="stylesheet" href="/tests/SimpleTest/test.css">
+</head>
+<body>
+<canvas id="c" width="64" height="64"></canvas>
+<canvas id="c2" width="64" height="64"></canvas>
+<canvas id="c-ref" width="64" height="64"></canvas>
+<script>
+
+SimpleTest.waitForExplicitFinish();
+
+function runTest() {
+
+  var worker = new Worker("offscreencanvas.js");
+
+  ok(worker, "Web worker successfully created");
+
+  worker.onmessage = function(evt) {
+    var msg = evt.data || {};
+    if (msg.type == "test") {
+      ok(msg.result, msg.name);
+    }
+    if (msg.type == "imagebitmap") {
+      // testing toBlob
+      // Fill c-ref with green color.
+      var c = document.getElementById("c-ref");
+      var ctx = c.getContext("2d");
+      ctx.rect(0, 0, 64, 64);
+      ctx.fillStyle = "#00FF00";
+      ctx.fill();
+
+      var htmlCanvas = document.getElementById("c");
+      var bitmapRenderer = htmlCanvas.getContext("bitmaprenderer");
+      bitmapRenderer.transferImageBitmap(msg.bitmap);
+
+      ok(c.toDataURL() == htmlCanvas.toDataURL(),
+         "imagebitmap should return a 64x64 green square");
+
+      // The ownership of msg.bitmap should be transferred to canvas "c" when
+      // we called transferImageBitmap. So we test if the ownership is actually
+      // transferred here.
+      var htmlCanvas = document.getElementById("c2");
+      var bitmapRenderer = htmlCanvas.getContext("bitmaprenderer");
+      bitmapRenderer.transferImageBitmap(msg.bitmap);
+
+      SimpleTest.doesThrow(
+        function() { c2.toDataURL(); },
+        "ImageBitmap has been transferred, toDataURL will throw.");
+
+      worker.terminate();
+      SimpleTest.finish();
+    }
+  }
+
+  worker.postMessage({test: 'webgl_imagebitmap'});
+}
+
+SpecialPowers.pushPrefEnv({'set': [
+  ['gfx.offscreencanvas.enabled', true],
+  ['webgl.force-enabled', true],
+]}, runTest);
+
+</script>
+</body>
+</html>

dom/canvas/test/webgl-mochitest.ini

@@ -13,7 +13,6 @@ fail-if = (os == 'b2g')
 support-files = captureStream_common.js
 [webgl-mochitest/test_cubemap_must_be_square.html]
 [webgl-mochitest/test_depth_tex_lazy_clear.html]
-skip-if = 1
 [webgl-mochitest/test_draw.html]
 [webgl-mochitest/test_fb_param.html]
 [webgl-mochitest/test_fb_param_crash.html]

dom/html/HTMLCanvasElement.cpp

@@ -374,7 +374,8 @@ HTMLCanvasElement::~HTMLCanvasElement()
 
 NS_IMPL_CYCLE_COLLECTION_INHERITED(HTMLCanvasElement, nsGenericHTMLElement,
                                    mCurrentContext, mPrintCallback,
-                                   mPrintState, mOriginalCanvas)
+                                   mPrintState, mOriginalCanvas,
+                                   mOffscreenCanvas)
 
 NS_IMPL_ADDREF_INHERITED(HTMLCanvasElement, Element)
 NS_IMPL_RELEASE_INHERITED(HTMLCanvasElement, Element)
@@ -779,10 +780,17 @@ HTMLCanvasElement::TransferControlToOffscreen(ErrorResult& aRv)
     renderer->SetWidth(sz.width);
     renderer->SetHeight(sz.height);
 
-    mOffscreenCanvas = new OffscreenCanvas(sz.width,
+    nsCOMPtr<nsIGlobalObject> global =
+      do_QueryInterface(OwnerDoc()->GetInnerWindow());
+    mOffscreenCanvas = new OffscreenCanvas(global,
+                                           sz.width,
                                            sz.height,
                                            GetCompositorBackendType(),
                                            renderer);
+    if (mWriteOnly) {
+      mOffscreenCanvas->SetWriteOnly();
+    }
+
     if (!mContextObserver) {
       mContextObserver = new HTMLCanvasElementObserver(this);
     }
@@ -1038,9 +1046,9 @@ HTMLCanvasElement::GetOpaqueAttr()
   return HasAttr(kNameSpaceID_None, nsGkAtoms::moz_opaque);
 }
 
-already_AddRefed<CanvasLayer>
+already_AddRefed<Layer>
 HTMLCanvasElement::GetCanvasLayer(nsDisplayListBuilder* aBuilder,
-                                  CanvasLayer *aOldLayer,
+                                  Layer *aOldLayer,
                                   LayerManager *aManager)
 {
   // The address of sOffscreenCanvasLayerUserDataDummy is used as the user
@@ -1056,7 +1064,7 @@ HTMLCanvasElement::GetCanvasLayer(nsDisplayListBuilder* aBuilder,
   if (mOffscreenCanvas) {
     if (!mResetLayer &&
         aOldLayer && aOldLayer->HasUserData(&sOffscreenCanvasLayerUserDataDummy)) {
-      RefPtr<CanvasLayer> ret = aOldLayer;
+      RefPtr<Layer> ret = aOldLayer;
       return ret.forget();
     }
 
@@ -1173,7 +1181,7 @@ void
 HTMLCanvasElement::SetFrameCapture(already_AddRefed<SourceSurface> aSurface)
 {
   RefPtr<SourceSurface> surface = aSurface;
-  RefPtr<CairoImage> image = new CairoImage(surface->GetSize(), surface);
+  RefPtr<SourceSurfaceImage> image = new SourceSurfaceImage(surface->GetSize(), surface);
 
   // Loop backwards to allow removing elements in the loop.
   for (int i = mRequestedFrameListeners.Length() - 1; i >= 0; --i) {

dom/html/HTMLCanvasElement.h

@@ -31,6 +31,7 @@ namespace layers {
 class AsyncCanvasRenderer;
 class CanvasLayer;
 class Image;
+class Layer;
 class LayerManager;
 } // namespace layers
 namespace gfx {
@@ -120,6 +121,7 @@ class HTMLCanvasElement final : public nsGenericHTMLElement,
 
   typedef layers::AsyncCanvasRenderer AsyncCanvasRenderer;
   typedef layers::CanvasLayer CanvasLayer;
+  typedef layers::Layer Layer;
   typedef layers::LayerManager LayerManager;
 
 public:
@@ -308,8 +310,8 @@ public:
    * Helpers called by various users of Canvas
    */
 
-  already_AddRefed<CanvasLayer> GetCanvasLayer(nsDisplayListBuilder* aBuilder,
-                                               CanvasLayer *aOldLayer,
+  already_AddRefed<Layer> GetCanvasLayer(nsDisplayListBuilder* aBuilder,
+                                         Layer *aOldLayer,
                                          LayerManager *aManager);
   // Should return true if the canvas layer should always be marked inactive.
   // We should return true here if we can't do accelerated compositing with

dom/html/HTMLImageElement.cpp

@@ -996,7 +996,7 @@ HTMLImageElement::PictureSourceSrcsetChanged(nsIContent *aSourceNode,
     mResponsiveSelector->SetCandidatesFromSourceSet(aNewValue);
   }
 
-  if (!mInDocResponsiveContent) {
+  if (!mInDocResponsiveContent && IsInComposedDoc()) {
     nsIDocument* doc = GetOurOwnerDoc();
     if (doc) {
       doc->AddResponsiveContent(this);

dom/html/HTMLInputElement.cpp

@@ -295,20 +295,25 @@ NS_IMPL_ISUPPORTS(UploadLastDir::ContentPrefCallback, nsIContentPrefCallback2)
 NS_IMETHODIMP
 UploadLastDir::ContentPrefCallback::HandleCompletion(uint16_t aReason)
 {
-  nsCOMPtr<nsIFile> localFile = do_CreateInstance(NS_LOCAL_FILE_CONTRACTID);
-  NS_ENSURE_STATE(localFile);
-
-  if (aReason == nsIContentPrefCallback2::COMPLETE_ERROR ||
-      !mResult) {
-    // Default to "desktop" directory for each platform
-    nsCOMPtr<nsIFile> homeDir;
-    NS_GetSpecialDirectory(NS_OS_DESKTOP_DIR, getter_AddRefs(homeDir));
-    localFile = do_QueryInterface(homeDir);
-  } else {
+  nsCOMPtr<nsIFile> localFile;
   nsAutoString prefStr;
+
+  if (aReason == nsIContentPrefCallback2::COMPLETE_ERROR || !mResult) {
+    prefStr = Preferences::GetString("dom.input.fallbackUploadDir");
+    if (prefStr.IsEmpty()) {
+      // If no custom directory was set through the pref, default to
+      // "desktop" directory for each platform.
+      NS_GetSpecialDirectory(NS_OS_DESKTOP_DIR, getter_AddRefs(localFile));
+    }
+  }
+
+  if (!localFile) {
+    if (prefStr.IsEmpty() && mResult) {
       nsCOMPtr<nsIVariant> pref;
       mResult->GetValue(getter_AddRefs(pref));
       pref->GetAsAString(prefStr);
+    }
+    localFile = do_CreateInstance(NS_LOCAL_FILE_CONTRACTID);
     localFile->InitWithPath(prefStr);
   }
 

dom/html/test/mochitest.ini

@@ -600,3 +600,5 @@ skip-if = buildapp == 'b2g' # bug 1129014
 [test_image_clone_load.html]
 [test_bug1203668.html]
 [test_bug1166138.html]
+[test_filepicker_default_directory.html]
+skip-if = buildapp == 'mulet' || buildapp == 'b2g' || toolkit == 'android'

dom/html/test/test_filepicker_default_directory.html

@@ -0,0 +1,83 @@
+<!DOCTYPE html>
+<html>
+<!--
+https://bugzilla.mozilla.org/show_bug.cgi?id=1194893
+-->
+<head>
+  <title>Test for filepicker default directory</title>
+  <script type="text/javascript" src="/tests/SimpleTest/SimpleTest.js"></script>
+  <script type="application/javascript" src="/tests/SimpleTest/EventUtils.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />
+</head>
+<body>
+<a target="_blank" href="https://bugzilla.mozilla.org/show_bug.cgi?id=1194893">Mozilla Bug 1194893</a>
+<div id="content">
+  <input type="file" id="f">
+</div>
+<pre id="text">
+<script class="testbody" type="application/javascript">
+
+SimpleTest.waitForExplicitFinish();
+const { Cc: Cc, Ci: Ci } = SpecialPowers;
+
+// Platform-independent directory names are #define'd in xpcom/io/nsDirectoryServiceDefs.h
+var defaultUploadDirectory = Cc["@mozilla.org/file/directory_service;1"]
+                            .getService(Ci.nsIDirectoryService)
+                            .QueryInterface(Ci.nsIProperties)
+                            .get("Desk", Ci.nsIFile);
+
+// When we want to test an upload directory other than the default, we need to
+// get a valid directory in a platform-independent way. Since NS_OS_DESKTOP_DIR
+// may fallback to NS_OS_HOME_DIR, let's use NS_OS_TMP_DIR.
+var customUploadDirectory = Cc["@mozilla.org/file/directory_service;1"]
+                            .getService(Ci.nsIDirectoryService)
+                            .QueryInterface(Ci.nsIProperties)
+                            .get("TmpD", Ci.nsIFile);
+
+// Useful for debugging
+//info("defaultUploadDirectory" + defaultUploadDirectory.path);
+//info("customUploadDirectory" + customUploadDirectory.path);
+
+var MockFilePicker = SpecialPowers.MockFilePicker;
+MockFilePicker.init(window);
+
+// need to show the MockFilePicker so .displayDirectory gets set
+var f = document.getElementById("f");
+f.focus();
+
+var testIndex = 0;
+var tests = [
+  ["", defaultUploadDirectory.path],
+  [customUploadDirectory.path, customUploadDirectory.path]
+]
+
+MockFilePicker.showCallback = function(filepicker) {
+  info(SpecialPowers.wrap(MockFilePicker).displayDirectory.path);
+
+  is(SpecialPowers.wrap(MockFilePicker).displayDirectory.path,
+  tests[testIndex][1]);
+
+  if (++testIndex == tests.length) {
+    MockFilePicker.cleanup();
+    SimpleTest.finish();
+  } else {
+    launchNextTest();
+  }
+}
+
+function launchNextTest() {
+  SpecialPowers.pushPrefEnv(
+    { 'set': [
+      ['dom.input.fallbackUploadDir', tests[testIndex][0]],
+    ]},
+  function () {
+    f.click();
+  });
+}
+
+launchNextTest();
+
+</script>
+</pre>
+</body>
+</html>

dom/ipc/StructuredCloneData.cpp

@@ -44,7 +44,7 @@ StructuredCloneData::Copy(const StructuredCloneData& aData)
   MOZ_ASSERT(BlobImpls().IsEmpty());
   BlobImpls().AppendElements(aData.BlobImpls());
 
-  MOZ_ASSERT(GetImages().IsEmpty());
+  MOZ_ASSERT(GetSurfaces().IsEmpty());
 
   return true;
 }

dom/media/MediaDecoder.cpp

@@ -790,6 +790,7 @@ MediaDecoder::Seek(double aTime, SeekTarget::Type aSeekType)
 
   UpdateDormantState(false /* aDormantTimeout */, true /* aActivity */);
 
+  MOZ_ASSERT(!mIsDormant, "should be out of dormant by now");
   MOZ_ASSERT(aTime >= 0.0, "Cannot seek to a negative value.");
 
   int64_t timeUsecs = 0;

dom/media/MediaDecoderStateMachine.cpp

@@ -782,6 +782,17 @@ MediaDecoderStateMachine::OnNotDecoded(MediaData::Type aType,
                self->WaitRequestRef(aRejection.mType).Complete();
              }));
 
+    // We are out of data to decode and will enter buffering mode soon.
+    // We want to play the frames we have already decoded, so we stop pre-rolling
+    // and ensure that loadeddata is fired as required.
+    if (isAudio) {
+      StopPrerollingAudio();
+    } else {
+      StopPrerollingVideo();
+    }
+    if (mState == DECODER_STATE_BUFFERING || mState == DECODER_STATE_DECODING) {
+        MaybeFinishDecodeFirstFrame();
+    }
     return;
   }
 
@@ -1481,7 +1492,7 @@ MediaDecoderStateMachine::Seek(SeekTarget aTarget)
     return MediaDecoder::SeekPromise::CreateAndReject(/* aIgnored = */ true, __func__);
   }
 
-  NS_ASSERTION(mState > DECODER_STATE_DECODING_METADATA,
+  MOZ_ASSERT(mState > DECODER_STATE_DECODING_METADATA,
                "We should have got duration already");
 
   if (mState < DECODER_STATE_DECODING ||

dom/media/MediaEventSource.h

@@ -9,6 +9,7 @@
 
 #include "mozilla/AbstractThread.h"
 #include "mozilla/Atomics.h"
+#include "mozilla/IndexSequence.h"
 #include "mozilla/Mutex.h"
 #include "mozilla/Tuple.h"
 #include "mozilla/TypeTraits.h"

dom/media/MediaFormatReader.cpp

@@ -546,6 +546,9 @@ MediaFormatReader::OnDemuxFailed(TrackType aTrack, DemuxerFailureReason aFailure
       NotifyError(aTrack);
       break;
     case DemuxerFailureReason::WAITING_FOR_DATA:
+      if (!decoder.mWaitingForData) {
+        decoder.mNeedDraining = true;
+      }
       NotifyWaitingForData(aTrack);
       break;
     case DemuxerFailureReason::CANCELED:
@@ -691,6 +694,9 @@ MediaFormatReader::NotifyWaitingForData(TrackType aTrack)
   MOZ_ASSERT(OnTaskQueue());
   auto& decoder = GetDecoderData(aTrack);
   decoder.mWaitingForData = true;
+  if (decoder.mTimeThreshold) {
+    decoder.mTimeThreshold.ref().mWaiting = true;
+  }
   ScheduleUpdate(aTrack);
 }
 
@@ -760,17 +766,31 @@ MediaFormatReader::UpdateReceivedNewData(TrackType aTrack)
   if (!decoder.mReceivedNewData) {
     return false;
   }
-  decoder.mReceivedNewData = false;
-  decoder.mWaitingForData = false;
-  bool hasLastEnd;
-  media::TimeUnit lastEnd = decoder.mTimeRanges.GetEnd(&hasLastEnd);
+
   // Update our cached TimeRange.
   decoder.mTimeRanges = decoder.mTrackDemuxer->GetBuffered();
-  if (decoder.mTimeRanges.Length() &&
-      (!hasLastEnd || decoder.mTimeRanges.GetEnd() > lastEnd)) {
+
+  if (decoder.mDrainComplete || decoder.mDraining) {
+    // We do not want to clear mWaitingForData or mDemuxEOS while
+    // a drain is in progress in order to properly complete the operation.
+    return false;
+  }
+
+  bool hasLastEnd;
+  media::TimeUnit lastEnd = decoder.mTimeRanges.GetEnd(&hasLastEnd);
+  if (hasLastEnd) {
+    if (decoder.mLastTimeRangesEnd && decoder.mLastTimeRangesEnd.ref() > lastEnd) {
       // New data was added after our previous end, we can clear the EOS flag.
       decoder.mDemuxEOS = false;
     }
+    decoder.mLastTimeRangesEnd = Some(lastEnd);
+  }
+
+  decoder.mReceivedNewData = false;
+  if (decoder.mTimeThreshold) {
+    decoder.mTimeThreshold.ref().mWaiting = false;
+  }
+  decoder.mWaitingForData = false;
 
   if (decoder.mError) {
     return false;
@@ -808,6 +828,8 @@ MediaFormatReader::RequestDemuxSamples(TrackType aTrack)
 
   if (decoder.mDemuxEOS) {
     // Nothing left to demux.
+    // We do not want to attempt to demux while in waiting for data mode
+    // as it would retrigger an unecessary drain.
     return;
   }
 
@@ -883,6 +905,7 @@ MediaFormatReader::HandleDemuxedSamples(TrackType aTrack,
           info->GetID());
       decoder.mInfo = info;
       decoder.mLastStreamSourceID = info->GetID();
+      decoder.mNextStreamSourceID.reset();
       // Flush will clear our array of queued samples. So make a copy now.
       nsTArray<RefPtr<MediaRawData>> samples{decoder.mQueuedSamples};
       Flush(aTrack);
@@ -892,38 +915,11 @@ MediaFormatReader::HandleDemuxedSamples(TrackType aTrack,
         decoder.mQueuedSamples.AppendElements(Move(samples));
         NotifyDecodingRequested(aTrack);
       } else {
-        MOZ_ASSERT(decoder.mTimeThreshold.isNothing());
+        SeekTarget seekTarget =
+          decoder.mTimeThreshold.refOr(SeekTarget(TimeUnit::FromMicroseconds(sample->mTime), false));
         LOG("Stream change occurred on a non-keyframe. Seeking to:%lld",
-            sample->mTime);
-        decoder.mTimeThreshold = Some(TimeUnit::FromMicroseconds(sample->mTime));
-        RefPtr<MediaFormatReader> self = this;
-        decoder.ResetDemuxer();
-        decoder.mSeekRequest.Begin(decoder.mTrackDemuxer->Seek(decoder.mTimeThreshold.ref())
-                   ->Then(OwnerThread(), __func__,
-                          [self, aTrack] (media::TimeUnit aTime) {
-                            auto& decoder = self->GetDecoderData(aTrack);
-                            decoder.mSeekRequest.Complete();
-                            self->NotifyDecodingRequested(aTrack);
-                          },
-                          [self, aTrack] (DemuxerFailureReason aResult) {
-                            auto& decoder = self->GetDecoderData(aTrack);
-                            decoder.mSeekRequest.Complete();
-                            switch (aResult) {
-                              case DemuxerFailureReason::WAITING_FOR_DATA:
-                                self->NotifyWaitingForData(aTrack);
-                                break;
-                              case DemuxerFailureReason::END_OF_STREAM:
-                                self->NotifyEndOfStream(aTrack);
-                                break;
-                              case DemuxerFailureReason::CANCELED:
-                              case DemuxerFailureReason::SHUTDOWN:
-                                break;
-                              default:
-                                self->NotifyError(aTrack);
-                                break;
-                            }
-                            decoder.mTimeThreshold.reset();
-                          }));
+            seekTarget.mTime.ToMicroseconds());
+        InternalSeek(aTrack, seekTarget);
       }
       return;
     }
@@ -957,6 +953,42 @@ MediaFormatReader::HandleDemuxedSamples(TrackType aTrack,
   decoder.mInputExhausted = false;
 }
 
+void
+MediaFormatReader::InternalSeek(TrackType aTrack, const SeekTarget& aTarget)
+{
+  MOZ_ASSERT(OnTaskQueue());
+  auto& decoder = GetDecoderData(aTrack);
+  decoder.mTimeThreshold = Some(aTarget);
+  RefPtr<MediaFormatReader> self = this;
+  decoder.ResetDemuxer();
+  decoder.mSeekRequest.Begin(decoder.mTrackDemuxer->Seek(decoder.mTimeThreshold.ref().mTime)
+             ->Then(OwnerThread(), __func__,
+                    [self, aTrack] (media::TimeUnit aTime) {
+                      auto& decoder = self->GetDecoderData(aTrack);
+                      decoder.mSeekRequest.Complete();
+                      self->NotifyDecodingRequested(aTrack);
+                    },
+                    [self, aTrack] (DemuxerFailureReason aResult) {
+                      auto& decoder = self->GetDecoderData(aTrack);
+                      decoder.mSeekRequest.Complete();
+                      switch (aResult) {
+                        case DemuxerFailureReason::WAITING_FOR_DATA:
+                          self->NotifyWaitingForData(aTrack);
+                          break;
+                        case DemuxerFailureReason::END_OF_STREAM:
+                          self->NotifyEndOfStream(aTrack);
+                          break;
+                        case DemuxerFailureReason::CANCELED:
+                        case DemuxerFailureReason::SHUTDOWN:
+                          break;
+                        default:
+                          self->NotifyError(aTrack);
+                          break;
+                      }
+                      decoder.mTimeThreshold.reset();
+                    }));
+}
+
 void
 MediaFormatReader::DrainDecoder(TrackType aTrack)
 {
@@ -992,7 +1024,6 @@ MediaFormatReader::Update(TrackType aTrack)
 
   LOGV("Processing update for %s", TrackTypeToStr(aTrack));
 
-  bool needInput = false;
   bool needOutput = false;
   auto& decoder = GetDecoderData(aTrack);
   decoder.mUpdateScheduled = false;
@@ -1006,87 +1037,108 @@ MediaFormatReader::Update(TrackType aTrack)
     return;
   }
 
-  if (!decoder.HasPromise() && decoder.mWaitingForData) {
-    // Nothing more we can do at present.
-    LOGV("Still waiting for data.");
-    return;
-  }
-
   // Record number of frames decoded and parsed. Automatically update the
   // stats counters using the AutoNotifyDecoded stack-based class.
   AbstractMediaDecoder::AutoNotifyDecoded a(mDecoder);
 
-  if (aTrack == TrackInfo::kVideoTrack) {
-    uint64_t delta =
-      decoder.mNumSamplesOutputTotal - mLastReportedNumDecodedFrames;
-    a.mDecoded = static_cast<uint32_t>(delta);
-    mLastReportedNumDecodedFrames = decoder.mNumSamplesOutputTotal;
+  // Drop any frames found prior our internal seek target.
+  while (decoder.mTimeThreshold && decoder.mOutput.Length()) {
+    RefPtr<MediaData>& output = decoder.mOutput[0];
+    SeekTarget target = decoder.mTimeThreshold.ref();
+    media::TimeUnit time = media::TimeUnit::FromMicroseconds(output->mTime);
+    if (time >= target.mTime) {
+      // We have reached our internal seek target.
+      decoder.mTimeThreshold.reset();
+    }
+    if (time < target.mTime || target.mDropTarget) {
+      LOGV("Internal Seeking: Dropping %s frame time:%f wanted:%f (kf:%d)",
+           TrackTypeToStr(aTrack),
+           media::TimeUnit::FromMicroseconds(output->mTime).ToSeconds(),
+           target.mTime.ToSeconds(),
+           output->mKeyframe);
+      decoder.mOutput.RemoveElementAt(0);
+    }
   }
 
   if (decoder.HasPromise()) {
     needOutput = true;
-    if (!decoder.mOutput.IsEmpty()) {
+    if (decoder.mOutput.Length()) {
       // We have a decoded sample ready to be returned.
       if (aTrack == TrackType::kVideoTrack) {
+        uint64_t delta =
+          decoder.mNumSamplesOutputTotal - mLastReportedNumDecodedFrames;
+        a.mDecoded = static_cast<uint32_t>(delta);
+        mLastReportedNumDecodedFrames = decoder.mNumSamplesOutputTotal;
         nsCString error;
         mVideo.mIsHardwareAccelerated =
           mVideo.mDecoder && mVideo.mDecoder->IsHardwareAccelerated(error);
       }
-      while (decoder.mOutput.Length()) {
       RefPtr<MediaData> output = decoder.mOutput[0];
       decoder.mOutput.RemoveElementAt(0);
       decoder.mSizeOfQueue -= 1;
-        if (decoder.mTimeThreshold.isNothing() ||
-            media::TimeUnit::FromMicroseconds(output->mTime) >= decoder.mTimeThreshold.ref()) {
+      decoder.mLastSampleTime =
+        Some(media::TimeUnit::FromMicroseconds(output->mTime));
       ReturnOutput(output, aTrack);
-          decoder.mTimeThreshold.reset();
-          break;
-        } else {
-          LOGV("Internal Seeking: Dropping frame time:%f wanted:%f (kf:%d)",
-               media::TimeUnit::FromMicroseconds(output->mTime).ToSeconds(),
-               decoder.mTimeThreshold.ref().ToSeconds(),
-               output->mKeyframe);
-        }
-      }
+    } else if (decoder.mError) {
+      LOG("Rejecting %s promise: DECODE_ERROR", TrackTypeToStr(aTrack));
+      decoder.RejectPromise(DECODE_ERROR, __func__);
+      return;
     } else if (decoder.mDrainComplete) {
+      bool wasDraining = decoder.mDraining;
       decoder.mDrainComplete = false;
       decoder.mDraining = false;
-      if (decoder.mError) {
-        LOG("Decoding Error");
-        decoder.RejectPromise(DECODE_ERROR, __func__);
-        return;
-      } else if (decoder.mDemuxEOS) {
+      if (decoder.mDemuxEOS) {
+        LOG("Rejecting %s promise: EOS", TrackTypeToStr(aTrack));
         decoder.RejectPromise(END_OF_STREAM, __func__);
-      }
-    } else if (decoder.mError) {
-      decoder.RejectPromise(DECODE_ERROR, __func__);
-      return;
       } else if (decoder.mWaitingForData) {
-      LOG("Waiting For Data");
+        if (wasDraining && decoder.mLastSampleTime &&
+            !decoder.mNextStreamSourceID) {
+          // We have completed draining the decoder following WaitingForData.
+          // Set up the internal seek machinery to be able to resume from the
+          // last sample decoded.
+          LOG("Seeking to last sample time: %lld",
+              decoder.mLastSampleTime.ref().ToMicroseconds());
+          InternalSeek(aTrack, SeekTarget(decoder.mLastSampleTime.ref(), true));
+        }
+        LOG("Rejecting %s promise: WAITING_FOR_DATA", TrackTypeToStr(aTrack));
         decoder.RejectPromise(WAITING_FOR_DATA, __func__);
+      }
+      // Now that draining has completed, we check if we have received
+      // new data again as the result may now be different from the earlier
+      // run.
+      if (UpdateReceivedNewData(aTrack)) {
+        LOGV("Nothing more to do");
         return;
       }
     }
+  }
 
   if (decoder.mNeedDraining) {
     DrainDecoder(aTrack);
     return;
   }
 
-  if (!NeedInput(decoder)) {
+  bool needInput = NeedInput(decoder);
+
+  LOGV("Update(%s) ni=%d no=%d ie=%d, in:%llu out:%llu qs=%u pending:%u waiting:%d ahead:%d sid:%u",
+       TrackTypeToStr(aTrack), needInput, needOutput, decoder.mInputExhausted,
+       decoder.mNumSamplesInput, decoder.mNumSamplesOutput,
+       uint32_t(size_t(decoder.mSizeOfQueue)), uint32_t(decoder.mOutput.Length()),
+       decoder.mWaitingForData, !decoder.HasPromise(), decoder.mLastStreamSourceID);
+
+  if (decoder.mWaitingForData &&
+      (!decoder.mTimeThreshold || decoder.mTimeThreshold.ref().mWaiting)) {
+    // Nothing more we can do at present.
+    LOGV("Still waiting for data.");
+    return;
+  }
+
+  if (!needInput) {
     LOGV("No need for additional input (pending:%u)",
          uint32_t(decoder.mOutput.Length()));
     return;
   }
 
-  needInput = true;
-
-  LOGV("Update(%s) ni=%d no=%d ie=%d, in:%llu out:%llu qs=%u pending:%u ahead:%d sid:%u",
-       TrackTypeToStr(aTrack), needInput, needOutput, decoder.mInputExhausted,
-       decoder.mNumSamplesInput, decoder.mNumSamplesOutput,
-       uint32_t(size_t(decoder.mSizeOfQueue)), uint32_t(decoder.mOutput.Length()),
-       !decoder.HasPromise(), decoder.mLastStreamSourceID);
-
   // Demux samples if we don't have some.
   RequestDemuxSamples(aTrack);
 

dom/media/MediaFormatReader.h

@@ -127,6 +127,22 @@ private:
   // Decode any pending already demuxed samples.
   bool DecodeDemuxedSamples(TrackType aTrack,
                             MediaRawData* aSample);
+
+  struct SeekTarget {
+    SeekTarget(const media::TimeUnit& aTime, bool aDropTarget)
+      : mTime(aTime)
+      , mDropTarget(aDropTarget)
+      , mWaiting(false)
+    {}
+
+    media::TimeUnit mTime;
+    bool mDropTarget;
+    bool mWaiting;
+  };
+  // Perform an internal seek to aTime. If aDropTarget is true then
+  // the first sample past the target will be dropped.
+  void InternalSeek(TrackType aTrack, const SeekTarget& aTarget);
+
   // Drain the current decoder.
   void DrainDecoder(TrackType aTrack);
   void NotifyNewOutput(TrackType aTrack, MediaData* aSample);
@@ -261,8 +277,11 @@ private:
     bool mDraining;
     bool mDrainComplete;
     // If set, all decoded samples prior mTimeThreshold will be dropped.
-    // Used for internal seeking when a change of stream is detected.
-    Maybe<media::TimeUnit> mTimeThreshold;
+    // Used for internal seeking when a change of stream is detected or when
+    // encountering data discontinuity.
+    Maybe<SeekTarget> mTimeThreshold;
+    // Time of last sample returned.
+    Maybe<media::TimeUnit> mLastSampleTime;
 
     // Decoded samples returned my mDecoder awaiting being returned to
     // state machine upon request.
@@ -300,6 +319,7 @@ private:
       mDraining = false;
       mDrainComplete = false;
       mTimeThreshold.reset();
+      mLastSampleTime.reset();
       mOutput.Clear();
       mNumSamplesInput = 0;
       mNumSamplesOutput = 0;
@@ -316,6 +336,7 @@ private:
     uint32_t mLastStreamSourceID;
     Maybe<uint32_t> mNextStreamSourceID;
     media::TimeIntervals mTimeRanges;
+    Maybe<media::TimeUnit> mLastTimeRangesEnd;
     RefPtr<SharedTrackInfo> mInfo;
   };
 

dom/media/mediasink/DecodedStream.cpp

@@ -480,7 +480,10 @@ DecodedStream::CreateData(MozPromiseHolder<GenericPromise>&& aPromise)
           self->mOutputStreamManager.Disconnect();
           delete data;
         });
-        AbstractThread::MainThread()->Dispatch(r.forget());
+        // We are in tail dispatching phase. Don't call
+        // AbstractThread::MainThread()->Dispatch() to avoid reentrant
+        // AutoTaskDispatcher.
+        NS_DispatchToMainThread(r.forget());
       }
     }
     RefPtr<DecodedStream> mThis;

dom/media/mediasink/VideoSink.cpp

@@ -4,6 +4,7 @@
  * License, v. 2.0. If a copy of the MPL was not distributed with this
  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
 
+#include "MediaQueue.h"
 #include "VideoSink.h"
 
 namespace mozilla {

dom/media/mediasource/MediaSourceDemuxer.cpp

@@ -295,7 +295,7 @@ MediaSourceTrackDemuxer::MediaSourceTrackDemuxer(MediaSourceDemuxer* aParent,
   , mManager(aManager)
   , mType(aType)
   , mMonitor("MediaSourceTrackDemuxer")
-  , mLastSeek(Some(TimeUnit()))
+  , mReset(true)
 {
 }
 
@@ -328,7 +328,8 @@ MediaSourceTrackDemuxer::Reset()
   RefPtr<MediaSourceTrackDemuxer> self = this;
   nsCOMPtr<nsIRunnable> task =
     NS_NewRunnableFunction([self] () {
-      self->mLastSeek = Some(TimeUnit());
+      self->mNextSample.reset();
+      self->mReset = true;
       self->mManager->Seek(self->mType, TimeUnit(), TimeUnit());
       {
         MonitorAutoLock mon(self->mMonitor);
@@ -380,42 +381,50 @@ MediaSourceTrackDemuxer::DoSeek(media::TimeUnit aTime)
   buffered.SetFuzz(MediaSourceDemuxer::EOS_FUZZ);
 
   if (!buffered.Contains(aTime)) {
-    mLastSeek = Some(aTime);
     // We don't have the data to seek to.
     return SeekPromise::CreateAndReject(DemuxerFailureReason::WAITING_FOR_DATA,
                                         __func__);
   }
   TimeUnit seekTime =
     mManager->Seek(mType, aTime, MediaSourceDemuxer::EOS_FUZZ);
+  bool error;
+  RefPtr<MediaRawData> sample =
+    mManager->GetSample(mType,
+                        media::TimeUnit(),
+                        error);
+  MOZ_ASSERT(!error && sample);
+  mNextSample = Some(sample);
+  mReset = false;
   {
     MonitorAutoLock mon(mMonitor);
     mNextRandomAccessPoint = mManager->GetNextRandomAccessPoint(mType);
   }
-  mLastSeek = Some(aTime);
   return SeekPromise::CreateAndResolve(seekTime, __func__);
 }
 
 RefPtr<MediaSourceTrackDemuxer::SamplesPromise>
 MediaSourceTrackDemuxer::DoGetSamples(int32_t aNumSamples)
 {
-  if (mLastSeek) {
+  if (mReset) {
     // If a seek (or reset) was recently performed, we ensure that the data
     // we are about to retrieve is still available.
     TimeIntervals buffered = mManager->Buffered(mType);
     buffered.SetFuzz(MediaSourceDemuxer::EOS_FUZZ);
 
-    if (!buffered.Contains(mLastSeek.ref())) {
+    if (!buffered.Contains(TimeUnit::FromMicroseconds(0))) {
       return SamplesPromise::CreateAndReject(
         mManager->IsEnded() ? DemuxerFailureReason::END_OF_STREAM :
                               DemuxerFailureReason::WAITING_FOR_DATA, __func__);
     }
-    mLastSeek.reset();
+    mReset = false;
   }
-  bool error;
-  RefPtr<MediaRawData> sample =
-    mManager->GetSample(mType,
-                        MediaSourceDemuxer::EOS_FUZZ,
-                        error);
+  bool error = false;
+  RefPtr<MediaRawData> sample;
+  if (mNextSample) {
+    sample = mNextSample.ref();
+    mNextSample.reset();
+  } else {
+    sample = mManager->GetSample(mType, MediaSourceDemuxer::EOS_FUZZ, error);
     if (!sample) {
       if (error) {
         return SamplesPromise::CreateAndReject(DemuxerFailureReason::DEMUXER_ERROR, __func__);
@@ -424,6 +433,7 @@ MediaSourceTrackDemuxer::DoGetSamples(int32_t aNumSamples)
         mManager->IsEnded() ? DemuxerFailureReason::END_OF_STREAM :
                               DemuxerFailureReason::WAITING_FOR_DATA, __func__);
     }
+  }
   RefPtr<SamplesHolder> samples = new SamplesHolder;
   samples->mSamples.AppendElement(sample);
   if (mNextRandomAccessPoint.ToMicroseconds() <= sample->mTime) {

dom/media/mediasource/MediaSourceDemuxer.h

@@ -129,7 +129,10 @@ private:
   // Monitor protecting members below accessed from multiple threads.
   Monitor mMonitor;
   media::TimeUnit mNextRandomAccessPoint;
-  Maybe<media::TimeUnit> mLastSeek;
+  Maybe<RefPtr<MediaRawData>> mNextSample;
+  // Set to true following a reset. Ensure that the next sample demuxed
+  // is available at position 0.
+  bool mReset;
 };
 
 } // namespace mozilla

dom/media/mediasource/test/mochitest.ini

@@ -40,7 +40,9 @@ skip-if = ((os == "win" && os_version == "5.1") || (os != "win" && os != "mac"))
 [test_BufferingWait.html]
 skip-if = toolkit == 'android' #timeout android bug 1199531
 [test_BufferingWait_mp4.html]
-skip-if = ((os == "win" && os_version == "5.1") || (os != "win" && os != "mac") || (os == "win" && os_version == "6.1")) # Only supported on osx and vista+, disabling on win7 bug 1191138
+skip-if = ((os == "win" && os_version == "5.1") || (os != "win" && os != "mac")) # Only supported on osx and vista+
+[test_DrainOnMissingData_mp4.html]
+skip-if = ((os == "win" && os_version == "5.1") || (os != "win" && os != "mac")) # Only supported on osx and vista+
 [test_EndOfStream.html]
 skip-if = (true || toolkit == 'android' || buildapp == 'mulet') #timeout android/mulet only bug 1101187 and bug 1182946
 [test_EndOfStream_mp4.html]
@@ -51,7 +53,7 @@ skip-if = ((os == "win" && os_version == "5.1") || (os != "win" && os != "mac"))
 [test_FrameSelection.html]
 [test_HaveMetadataUnbufferedSeek.html]
 [test_HaveMetadataUnbufferedSeek_mp4.html]
-skip-if = ((os == "win" && os_version == "5.1") || (os != "win" && os != "mac") || (os == "win" && os_version == "6.1")) # Only supported on osx and vista+, disabling on win7 bug 1191138
+skip-if = ((os == "win" && os_version == "5.1") || (os != "win" && os != "mac")) # Only supported on osx and vista+
 [test_LoadedDataFired_mp4.html]
 skip-if = ((os == "win" && os_version == "5.1") || (os != "win" && os != "mac")) # Only supported on osx and vista+
 [test_LoadedMetadataFired.html]
@@ -98,11 +100,11 @@ skip-if = ((os == "win" && os_version == "5.1") || (os != "win" && os != "mac"))
 skip-if = ((os == "win" && os_version == "5.1") || (os != "win" && os != "mac")) # Only supported on osx and vista+
 [test_TruncatedDuration.html]
 [test_TruncatedDuration_mp4.html]
-skip-if = ((os == "win" && os_version == "5.1") || (os != "win" && os != "mac") || (os == "win" && os_version == "6.1")) # Only supported on osx and vista+, disabling on win7 bug 1191138
+skip-if = ((os == "win" && os_version == "5.1") || (os != "win" && os != "mac")) # Only supported on osx and vista+
 [test_WaitingOnMissingData.html]
 skip-if = true # Disabled due to bug 1124493 and friends. WebM MSE is deprioritized.
 [test_WaitingOnMissingData_mp4.html]
-skip-if = ((os == "win" && os_version == "5.1") || (os != "win" && os != "mac") || (os == "win" && os_version == "6.1")) # Only supported on osx and vista+, disabling on win7 bug 1191138
+skip-if = ((os == "win" && os_version == "5.1") || (os != "win" && os != "mac")) # Only supported on osx and vista+
 [test_WaitingToEndedTransition_mp4.html]
-skip-if = ((os == "win" && os_version == "5.1") || (os != "win" && os != "mac") || (os == "win" && os_version == "6.1")) # Only supported on osx and vista+, disabling on win7 bug 1191138
+skip-if = ((os == "win" && os_version == "5.1") || (os != "win" && os != "mac")) # Only supported on osx and vista+
 

dom/media/mediasource/test/test_BufferingWait.html

@@ -41,14 +41,15 @@ runWithMSE(function(ms, v) {
       /* Note - Missing |46712, 67833 - 46712| segment here corresponding to (0.8, 1.2] */
       /* Note - Missing |67833, 88966 - 67833| segment here corresponding to (1.2, 1.6]  */
       loadSegment.bind(null, sb, new Uint8Array(arrayBuffer, 88966))).then(function() {
-        var promise = waitUntilTime(0.27);
+        // 0.767 is the time of the last video sample +- 40ms.
+        var promise = waitUntilTime(.767-0.04);
         info("Playing video. It should play for a bit, then fire 'waiting'");
         v.play();
         return promise;
       }).then(function() {
         window.firstStop = Date.now();
         loadSegment(sb, new Uint8Array(arrayBuffer, 46712, 67833 - 46712));
-        return waitUntilTime(0.66);
+        return waitUntilTime(1.167-0.04);
       }).then(function() {
         var waitDuration = (Date.now() - window.firstStop) / 1000;
         ok(waitDuration < 15, "Should not spend an inordinate amount of time buffering: " + waitDuration);

dom/media/mediasource/test/test_BufferingWait_mp4.html

@@ -41,18 +41,16 @@ runWithMSE(function(ms, v) {
     /* Note - Missing |bipbop4| segment here corresponding to (2.41, 3.20]  */
     .then(fetchAndLoad.bind(null, sb, 'bipbop/bipbop', ['5'], '.m4s'))
     .then(function() {
-        // Some decoders (Windows in particular) may keep up to 25 frames queued
-        // before returning a sample. 0.7 is 1.62s - 25 * 0.03333
-        var promise = waitUntilTime(0.7);
+        // last audio sample has a start time of 1.578956s
+        var promise = waitUntilTime(1.57895);
         info("Playing video. It should play for a bit, then fire 'waiting'");
         v.play();
         return promise;
       }).then(function() {
         window.firstStop = Date.now();
         fetchAndLoad(sb, 'bipbop/bipbop', ['3'], '.m4s');
-        // Some decoders (Windows in particular) may keep up to 25 frames queued
-        // before returning a sample. 1.5 is 2.41s - 25 * 0.03333
-        return waitUntilTime(1.5);
+        // last audio sample has a start time of 2.368435
+        return waitUntilTime(2.36843);
       }).then(function() {
         var waitDuration = (Date.now() - window.firstStop) / 1000;
         ok(waitDuration < 15, "Should not spend an inordinate amount of time buffering: " + waitDuration);

dom/media/mediasource/test/test_DrainOnMissingData_mp4.html

@@ -0,0 +1,60 @@
+<!DOCTYPE html>
+<html><head>
+<meta http-equiv="content-type" content="text/html; charset=windows-1252">
+  <title>MSE: |waiting| event when source data is missing</title>
+  <script type="text/javascript" src="/tests/SimpleTest/SimpleTest.js"></script>
+  <script type="text/javascript" src="mediasource.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />
+</head>
+<body>
+<pre id="test"><script class="testbody" type="text/javascript">
+
+SimpleTest.waitForExplicitFinish();
+
+runWithMSE(function(ms, el) {
+  el.controls = true;
+  once(ms, 'sourceopen').then(function() {
+    ok(true, "Receive a sourceopen event");
+    var videosb = ms.addSourceBuffer("video/mp4");
+    fetchAndLoad(videosb, 'bipbop/bipbop_video', ['init'], '.mp4')
+    .then(function() {
+      // Set appendWindowEnd to ensure we only have about 6 frames worth.
+      // We must feed at least 6 frames to pass the MDSM pre-roll.
+      videosb.appendWindowEnd = .4;
+      return fetchAndLoad(videosb, 'bipbop/bipbop_video', ['1'], '.m4s');
+    })
+    .then(function() {
+      info("Invoking play()");
+      var promises = [];
+      promises.push(once(el, 'playing'));
+      el.play();
+      return Promise.all(promises);
+    })
+    .then(function() {
+      info("got playing");
+      return once(el, 'waiting');
+    }).then(function() {
+      info("got waiting");
+      info("Loading more data");
+      // Waiting will be fired on the last frame +- 40ms.
+      isfuzzy(el.currentTime, videosb.buffered.end(0) - 1/30,
+              0.04, "Got a waiting event at " + el.currentTime);
+      videosb.appendWindowEnd = 1;
+      var p = once(el, 'ended');
+      var loads = fetchAndLoad(videosb, 'bipbop/bipbop_video', [1], '.m4s');
+      loads.then(() => ms.endOfStream());
+      return p;
+    }).then(function() {
+      // These fuzz factors are bigger than they should be. We should investigate
+      // and fix them in bug 1137574.
+      is(el.duration, 0.801666, "Video has correct duration: " + el.duration);
+      is(el.currentTime, el.duration, "Video has correct currentTime.");
+      SimpleTest.finish();
+    });
+  });
+});
+
+</script>
+</pre>
+</body>
+</html>

dom/media/mediasource/test/test_PlayEvents.html

@@ -24,6 +24,18 @@ SimpleTest.waitForExplicitFinish();
 runWithMSE(function(ms, el) {
   el.controls = true;
   once(ms, 'sourceopen').then(function() {
+    // Log events for debugging.
+    var events = ["suspend", "play", "canplay", "canplaythrough", "loadstart", "loadedmetadata",
+                  "loadeddata", "playing", "ended", "error", "stalled", "emptied", "abort",
+                  "waiting", "pause", "durationchange", "seeking", "seeked"];
+    function logEvent(e) {
+      var v = e.target;
+      info("got " + e.type + " event");
+    }
+    events.forEach(function(e) {
+      el.addEventListener(e, logEvent, false);
+    });
+
     ok(true, "Receive a sourceopen event");
     var videosb = ms.addSourceBuffer("video/mp4");
     el.addEventListener("error", function(e) {
@@ -37,9 +49,6 @@ runWithMSE(function(ms, el) {
        var promises = [];
        promises.push(once(el, 'loadeddata'));
        promises.push(once(el, 'canplay'));
-       // Load [0, 1.601666). We must ensure that we load over 25 frames as the
-       // windows H264 decoder will not produce a sample until then
-       // (bug 1191138).
        promises.push(fetchAndLoad(videosb, 'bipbop/bipbop_video', range(1, 3), '.m4s'));
        return Promise.all(promises);
     })

dom/media/mediasource/test/test_WaitingOnMissingData_mp4.html

@@ -40,9 +40,9 @@ runWithMSE(function(ms, el) {
       // currentTime is based on the current video frame, so if the audio ends just before
       // the next video frame, currentTime can be up to 1 frame's worth earlier than
       // min(audioEnd, videoEnd).
-      // Some decoders (Windows in particular) may keep up to 25 frames queued.
-      isfuzzy(el.currentTime, Math.min(audiosb.buffered.end(0), videosb.buffered.end(0)) - 1/60,
-              25 * 1/30, "Got a waiting event at " + el.currentTime);
+      // 0.0465 is the length of the last audio frame.
+      ok(el.currentTime >= (Math.min(audiosb.buffered.end(0), videosb.buffered.end(0)) - 0.0465),
+         "Got a waiting event at " + el.currentTime);
       info("Loading more data");
       var p = once(el, 'ended');
       var loads = Promise.all([fetchAndLoad(audiosb, 'bipbop/bipbop_audio', [5], '.m4s'),

dom/media/mediasource/test/test_WaitingToEndedTransition_mp4.html

@@ -17,6 +17,10 @@ runWithMSE(function(ms, el) {
     ok(true, "Receive a sourceopen event");
     var audiosb = ms.addSourceBuffer("audio/mp4");
     var videosb = ms.addSourceBuffer("video/mp4");
+    // ensure tracks end at approximately the same time to ensure ended event is
+    // always fired (bug 1233639).
+    audiosb.appendWindowEnd = 3.9;
+    videosb.appendWindowEnd = 3.9;
     fetchAndLoad(audiosb, 'bipbop/bipbop_audio', ['init'], '.mp4')
     .then(fetchAndLoad.bind(null, videosb, 'bipbop/bipbop_video', ['init'], '.mp4'))
     .then(fetchAndLoad.bind(null, audiosb, 'bipbop/bipbop_audio', range(1, 5), '.m4s'))
@@ -34,19 +38,12 @@ runWithMSE(function(ms, el) {
       var p = once(el, 'waiting');
       el.play();
       return p;
-    }).then(function() {
-      // currentTime is based on the current video frame, so if the audio ends just before
-      // the next video frame, currentTime can be up to 1 frame's worth earlier than
-      // min(audioEnd, videoEnd).
-      // Some decoders (Windows in particular) may keep up to 25 frames queued.
-      isfuzzy(el.currentTime, Math.min(audiosb.buffered.end(0), videosb.buffered.end(0)) - 1/60,
-              25 * 1/30, "Got a waiting event at " + el.currentTime);
     }).then(function() {
       var p = once(el, 'ended');
       ms.endOfStream();
       return p;
     }).then(function() {
-      is(el.duration, 4.005, "Video has correct duration: " + el.duration);
+      is(el.duration, 3.854512, "Video has correct duration: " + el.duration);
       is(el.currentTime, el.duration, "Video has correct currentTime.");
       SimpleTest.finish();
     });

dom/media/platforms/omx/OmxDataDecoder.cpp

@@ -226,23 +226,12 @@ OmxDataDecoder::DoAsyncShutdown()
   mWatchManager.Unwatch(mOmxState, &OmxDataDecoder::OmxStateRunner);
   mWatchManager.Unwatch(mPortSettingsChanged, &OmxDataDecoder::PortSettingsChanged);
 
-  // Do flush so all port can be returned to client.
+  // Flush to all ports, so all buffers can be returned from component.
   RefPtr<OmxDataDecoder> self = this;
   mOmxLayer->SendCommand(OMX_CommandFlush, OMX_ALL, nullptr)
     ->Then(mOmxTaskQueue, __func__,
            [self] () -> RefPtr<OmxCommandPromise> {
-             LOG("DoAsyncShutdown: flush complete, collecting buffers...");
-             self->CollectBufferPromises(OMX_DirMax)
-               ->Then(self->mOmxTaskQueue, __func__,
-                   [self] () {
-                     LOG("DoAsyncShutdown: releasing all buffers.");
-                     self->ReleaseBuffers(OMX_DirInput);
-                     self->ReleaseBuffers(OMX_DirOutput);
-                   },
-                   [self] () {
-                     self->mOmxLayer->Shutdown();
-                   });
-
+             LOG("DoAsyncShutdown: flush complete");
              return self->mOmxLayer->SendCommand(OMX_CommandStateSet, OMX_StateIdle, nullptr);
            },
            [self] () {
@@ -251,8 +240,30 @@ OmxDataDecoder::DoAsyncShutdown()
     ->CompletionPromise()
     ->Then(mOmxTaskQueue, __func__,
            [self] () -> RefPtr<OmxCommandPromise> {
-             LOG("DoAsyncShutdown: OMX_StateIdle");
-             return self->mOmxLayer->SendCommand(OMX_CommandStateSet, OMX_StateLoaded, nullptr);
+             RefPtr<OmxCommandPromise> p =
+               self->mOmxLayer->SendCommand(OMX_CommandStateSet, OMX_StateLoaded, nullptr);
+
+             LOG("DoAsyncShutdown: collecting buffers...");
+             self->CollectBufferPromises(OMX_DirMax)
+               ->Then(self->mOmxTaskQueue, __func__,
+                   [self] () {
+                   // According to spec 3.1.1.2.2.1:
+                   // OMX_StateLoaded needs to be sent before releasing buffers.
+                   // And state transition from OMX_StateIdle to OMX_StateLoaded
+                   // is completed when all of the buffers have been removed
+                   // from the component.
+                   // Here the buffer promises are not resolved due to displaying
+                   // in layer, it needs to wait before the layer returns the
+                   // buffers.
+                   LOG("DoAsyncShutdown: all buffers collected, releasing buffers...");
+                   self->ReleaseBuffers(OMX_DirInput);
+                   self->ReleaseBuffers(OMX_DirOutput);
+                   },
+                   [self] () {
+                     self->mOmxLayer->Shutdown();
+                   });
+
+             return p;
            },
            [self] () {
              self->mOmxLayer->Shutdown();

dom/media/webrtc/MediaEngineTabVideoSource.cpp

@@ -196,7 +196,7 @@ MediaEngineTabVideoSource::NotifyPull(MediaStreamGraph*,
   MonitorAutoLock mon(mMonitor);
 
   // Note: we're not giving up mImage here
-  RefPtr<layers::CairoImage> image = mImage;
+  RefPtr<layers::SourceSurfaceImage> image = mImage;
   StreamTime delta = aDesiredTime - aSource->GetEndOfAppendedData(aID);
   if (delta > 0) {
     // nullptr images are allowed
@@ -298,7 +298,7 @@ MediaEngineTabVideoSource::Draw() {
     return;
   }
 
-  RefPtr<layers::CairoImage> image = new layers::CairoImage(size, surface);
+  RefPtr<layers::SourceSurfaceImage> image = new layers::SourceSurfaceImage(size, surface);
 
   MonitorAutoLock mon(mMonitor);
   mImage = image;

dom/media/webrtc/MediaEngineTabVideoSource.h

@@ -88,7 +88,7 @@ private:
     ScopedFreePtr<unsigned char> mData;
     size_t mDataSize;
     nsCOMPtr<nsIDOMWindow> mWindow;
-    RefPtr<layers::CairoImage> mImage;
+    RefPtr<layers::SourceSurfaceImage> mImage;
     nsCOMPtr<nsITimer> mTimer;
     Monitor mMonitor;
     nsCOMPtr<nsITabSource> mTabSource;

dom/plugins/ipc/PluginInstanceParent.cpp

@@ -957,7 +957,7 @@ PluginInstanceParent::RecvShow(const NPRect& updatedRect,
 
         RefPtr<gfx::SourceSurface> sourceSurface =
             gfxPlatform::GetPlatform()->GetSourceSurfaceForSurface(nullptr, surface);
-        RefPtr<CairoImage> image = new CairoImage(surface->GetSize(), sourceSurface);
+        RefPtr<SourceSurfaceImage> image = new SourceSurfaceImage(surface->GetSize(), sourceSurface);
 
         nsAutoTArray<ImageContainer::NonOwningImage,1> imageList;
         imageList.AppendElement(

dom/security/nsCSPService.cpp

@@ -139,62 +139,6 @@ CSPService::ShouldLoad(uint32_t aContentType,
     return NS_OK;
   }
 
-  // ----- THIS IS A TEMPORARY FAST PATH FOR CERTIFIED APPS. -----
-  // ----- PLEASE REMOVE ONCE bug 925004 LANDS.              -----
-
-  // Cache the app status for this origin.
-  uint16_t status = nsIPrincipal::APP_STATUS_NOT_INSTALLED;
-  nsAutoCString sourceOrigin;
-  if (aRequestPrincipal && aRequestOrigin) {
-    aRequestOrigin->GetPrePath(sourceOrigin);
-    if (!mAppStatusCache.Get(sourceOrigin, &status)) {
-      aRequestPrincipal->GetAppStatus(&status);
-      mAppStatusCache.Put(sourceOrigin, status);
-    }
-  }
-
-  if (status == nsIPrincipal::APP_STATUS_CERTIFIED) {
-    // The CSP for certified apps is :
-    // "default-src * data: blob:; script-src 'self'; object-src 'none'; style-src 'self' app://theme.gaiamobile.org:*"
-    // That means we can optimize for this case by:
-    // - loading same origin scripts and stylesheets, and stylesheets from the
-    //   theme url space.
-    // - never loading objects.
-    // - accepting everything else.
-
-    switch (aContentType) {
-      case nsIContentPolicy::TYPE_SCRIPT:
-      case nsIContentPolicy::TYPE_STYLESHEET:
-        {
-          // Whitelist the theme resources.
-          auto themeOrigin = Preferences::GetCString("b2g.theme.origin");
-          nsAutoCString contentOrigin;
-          aContentLocation->GetPrePath(contentOrigin);
-
-          if (!(sourceOrigin.Equals(contentOrigin) ||
-                (themeOrigin && themeOrigin.Equals(contentOrigin)))) {
-            *aDecision = nsIContentPolicy::REJECT_SERVER;
-          }
-        }
-        break;
-
-      case nsIContentPolicy::TYPE_OBJECT:
-        *aDecision = nsIContentPolicy::REJECT_SERVER;
-        break;
-
-      default:
-        *aDecision = nsIContentPolicy::ACCEPT;
-    }
-
-    // Only cache and return if we are successful. If not, we want the error
-    // to be reported, and thus fallback to the slow path.
-    if (*aDecision == nsIContentPolicy::ACCEPT) {
-      return NS_OK;
-    }
-  }
-
-  // ----- END OF TEMPORARY FAST PATH FOR CERTIFIED APPS. -----
-
   // query the principal of the document; if no document is passed, then
   // fall back to using the requestPrincipal (e.g. service workers do not
   // pass a document).

dom/tests/mochitest/general/test_interfaces.html

@@ -703,6 +703,8 @@ var interfaceNamesInGlobalScope =
     "Image",
 // IMPORTANT: Do not change this list without review from a DOM peer!
     "ImageBitmap",
+// IMPORTANT: Do not change this list without review from a DOM peer!
+    "ImageBitmapRenderingContext",
 // IMPORTANT: Do not change this list without review from a DOM peer!
     {name: "ImageCapture", disabled: true},
 // IMPORTANT: Do not change this list without review from a DOM peer!

dom/webidl/FileReader.webidl

@@ -11,7 +11,7 @@
  */
 
 [Constructor,
- Exposed=(Window,System)]
+ Exposed=(Window,Worker,System)]
 interface FileReader : EventTarget {
   // async read methods
   [Throws]

dom/webidl/ImageBitmap.webidl

@@ -23,6 +23,18 @@ interface ImageBitmap {
   readonly attribute unsigned long height;
 };
 
+// It's crucial that there be a way to explicitly dispose of ImageBitmaps
+// since they refer to potentially large graphics resources. Some uses
+// of this API proposal will result in repeated allocations of ImageBitmaps,
+// and garbage collection will not reliably reclaim them quickly enough.
+// Here we reuse close(), which also exists on another Transferable type,
+// MessagePort. Potentially, all Transferable types should inherit from a
+// new interface type "Closeable".
+partial interface ImageBitmap {
+  // Dispose of all graphical resources associated with this ImageBitmap.
+  void close();
+};
+
 [NoInterfaceObject, Exposed=(Window,Worker)]
 interface ImageBitmapFactories {
   [Throws]

dom/webidl/ImageBitmapRenderingContext.webidl

@@ -0,0 +1,36 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://wiki.whatwg.org/wiki/OffscreenCanvas
+ *
+ * © Copyright 2004-2011 Apple Computer, Inc., Mozilla Foundation, and
+ * Opera Software ASA. You are granted a license to use, reproduce
+ * and create derivative works of this document.
+ */
+
+// The new ImageBitmapRenderingContext is a canvas rendering context
+// which only provides the functionality to replace the canvas's
+// contents with the given ImageBitmap. Its context id (the first argument
+// to getContext) is "bitmaprenderer".
+[Exposed=(Window,Worker)]
+interface ImageBitmapRenderingContext {
+  // Displays the given ImageBitmap in the canvas associated with this
+  // rendering context. Ownership of the ImageBitmap is transferred to
+  // the canvas. The caller may not use its reference to the ImageBitmap
+  // after making this call. (This semantic is crucial to enable prompt
+  // reclamation of expensive graphics resources, rather than relying on
+  // garbage collection to do so.)
+  //
+  // The ImageBitmap conceptually replaces the canvas's bitmap, but
+  // it does not change the canvas's intrinsic width or height.
+  //
+  // The ImageBitmap, when displayed, is clipped to the rectangle
+  // defined by the canvas's instrinsic width and height. Pixels that
+  // would be covered by the canvas's bitmap which are not covered by
+  // the supplied ImageBitmap are rendered transparent black. Any CSS
+  // styles affecting the display of the canvas are applied as usual.
+  void transferImageBitmap(ImageBitmap bitmap);
+};

dom/webidl/OffscreenCanvas.webidl

@@ -5,14 +5,10 @@
  *
  * For more information on this interface, please see
  * https://wiki.whatwg.org/wiki/OffscreenCanvas
- *
- * Current implementation focus on transfer canvas from main thread to worker.
- * So there are some spec doesn't implement, such as [Constructor], toBlob() and
- * transferToImageBitmap in OffscreenCanvas. Bug 1172796 will implement
- * remaining spec.
  */
 
-[Exposed=(Window,Worker),
+[Constructor(unsigned long width, unsigned long height),
+ Exposed=(Window,Worker),
  Func="mozilla::dom::OffscreenCanvas::PrefEnabled"]
 interface OffscreenCanvas : EventTarget {
   [Pure, SetterThrows]
@@ -23,6 +19,11 @@ interface OffscreenCanvas : EventTarget {
   [Throws]
   nsISupports? getContext(DOMString contextId,
                           optional any contextOptions = null);
+
+  ImageBitmap transferToImageBitmap();
+  [Throws]
+  Promise<Blob> toBlob(optional DOMString type = "",
+                       optional any encoderOptions);
 };
 
 // OffscreenCanvas implements Transferable;

dom/webidl/moz.build

@@ -265,6 +265,7 @@ WEBIDL_FILES = [
     'IDBTransaction.webidl',
     'IDBVersionChangeEvent.webidl',
     'ImageBitmap.webidl',
+    'ImageBitmapRenderingContext.webidl',
     'ImageCapture.webidl',
     'ImageData.webidl',
     'ImageDocument.webidl',

dom/workers/ScriptLoader.cpp

@@ -629,6 +629,7 @@ private:
     // If one load info cancels or hits an error, it can race with the start
     // callback coming from another load info.
     if (mCanceledMainThread || !mCacheCreator) {
+      aRequest->Cancel(NS_ERROR_FAILURE);
       return NS_ERROR_FAILURE;
     }
 

dom/workers/test/fileapi_chromeScript.js

@@ -0,0 +1,29 @@
+var { classes: Cc, interfaces: Ci, utils: Cu } = Components;
+Cu.importGlobalProperties(["File"]);
+
+var fileNum = 1;
+
+function createFileWithData(fileData) {
+  var willDelete = fileData === null;
+  var dirSvc = Cc["@mozilla.org/file/directory_service;1"].getService(Ci.nsIProperties);
+  var testFile = dirSvc.get("ProfD", Ci.nsIFile);
+  testFile.append("fileAPItestfile" + fileNum);
+  fileNum++;
+  var outStream = Cc["@mozilla.org/network/file-output-stream;1"].createInstance(Ci.nsIFileOutputStream);
+  outStream.init(testFile, 0x02 | 0x08 | 0x20, // write, create, truncate
+                 0666, 0);
+  if (willDelete) {
+    fileData = "some irrelevant test data\n";
+  }
+  outStream.write(fileData, fileData.length);
+  outStream.close();
+  var domFile = new File(testFile);
+  if (willDelete) {
+    testFile.remove(/* recursive: */ false);
+  }
+  return domFile;
+}
+
+addMessageListener("files.open", function (message) {
+  sendAsyncMessage("files.opened", message.map(createFileWithData));
+});

dom/workers/test/mochitest.ini

@@ -119,6 +119,8 @@ support-files =
   worker_referrer.js
   websocket_https.html
   websocket_https_worker.js
+  worker_fileReader.js
+  fileapi_chromeScript.js
 
 [test_404.html]
 [test_atob.html]
@@ -236,3 +238,4 @@ skip-if = (os == "win") || (os == "mac") || toolkit == 'android' #bug 798220
 [test_referrer.html]
 [test_sharedWorker_ports.html]
 [test_sharedWorker_lifetime.html]
+[test_fileReader.html]