Bug 1035420 - [geckoview] Implement chrome script injection r=bnicholson

mobile/android/base/GeckoView.java

@@ -243,6 +243,15 @@ public class GeckoView extends LayerView
         return Collections.unmodifiableList(browsers);
     }
 
+    public void importScript(final String url) {
+        if (url.startsWith("resource://android/assets/")) {
+            GeckoAppShell.sendEventToGecko(GeckoEvent.createBroadcastEvent("GeckoView:ImportScript", url));
+            return;
+        }
+
+        throw new IllegalArgumentException("Must import script from 'resources://android/assets/' location.");
+    }
+
     private void connectToGecko() {
         GeckoThread.setLaunchState(GeckoThread.LaunchState.GeckoRunning);
         Tab selectedTab = Tabs.getInstance().getSelectedTab();

mobile/android/chrome/content/EmbedRT.js

@@ -0,0 +1,64 @@
+/* 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/. */
+"use strict";
+
+XPCOMUtils.defineLazyModuleGetter(this, "ConsoleAPI",
+                                  "resource://gre/modules/devtools/Console.jsm");
+
+/*
+ * Collection of methods and features specific to using a GeckoView instance.
+ * The code is isolated from browser.js for code size and performance reasons.
+ */
+var EmbedRT = {
+  _scopes: {},
+
+  observe: function(subject, topic, data) {
+    switch(topic) {
+      case "GeckoView:ImportScript":
+        this.importScript(data);
+        break;
+    }
+  },
+
+  /*
+   * Loads a script file into a sandbox and calls an optional load function
+   */
+  importScript: function(scriptURL) {
+    if (scriptURL in this._scopes) {
+      return;
+    }
+
+    let principal = Cc["@mozilla.org/systemprincipal;1"].createInstance(Ci.nsIPrincipal);
+
+    let sandbox = new Cu.Sandbox(principal,
+      {
+        sandboxName: scriptURL,
+        wantGlobalProperties: ["indexedDB"]
+      }
+    );
+
+    sandbox["console"] = new ConsoleAPI({ consoleID: "script/" + scriptURL });
+
+    // As we don't want our caller to control the JS version used for the
+    // script file, we run loadSubScript within the context of the
+    // sandbox with the latest JS version set explicitly.
+    sandbox.__SCRIPT_URI_SPEC__ = scriptURL;
+    Cu.evalInSandbox("Components.classes['@mozilla.org/moz/jssubscript-loader;1'].createInstance(Components.interfaces.mozIJSSubScriptLoader).loadSubScript(__SCRIPT_URI_SPEC__);", sandbox, "ECMAv5");
+
+    this._scopes[scriptURL] = sandbox;
+
+    if ("load" in sandbox) {
+      let params = {
+        window: window,
+        resourceURI: scriptURL,
+      };
+
+      try {
+        sandbox["load"](params);
+      } catch(e) {
+        dump("Exception calling 'load' method in script: " + scriptURL + "\n" + e);
+      }
+    }
+  }
+};

mobile/android/chrome/content/browser.js

@@ -133,6 +133,7 @@ XPCOMUtils.defineLazyModuleGetter(this, "SharedPreferences",
   ["Feedback", ["Feedback:Show"], "chrome://browser/content/Feedback.js"],
   ["SelectionHandler", ["TextSelection:Get"], "chrome://browser/content/SelectionHandler.js"],
   ["Notifications", ["Notification:Event"], "chrome://browser/content/Notifications.jsm"],
+  ["EmbedRT", ["GeckoView:ImportScript"], "chrome://browser/content/EmbedRT.js"],
 ].forEach(function (aScript) {
   let [name, notifications, script] = aScript;
   XPCOMUtils.defineLazyGetter(window, name, function() {

mobile/android/chrome/jar.mn

@@ -39,6 +39,7 @@ chrome.jar:
   content/SelectHelper.js              (content/SelectHelper.js)
   content/SelectionHandler.js          (content/SelectionHandler.js)
 * content/WebappRT.js                  (content/WebappRT.js)
+  content/EmbedRT.js                   (content/EmbedRT.js)
   content/InputWidgetHelper.js         (content/InputWidgetHelper.js)
   content/WebrtcUI.js                  (content/WebrtcUI.js)
   content/MemoryObserver.js            (content/MemoryObserver.js)