Bug 1015894 - Use window.realFrameElement into b2g/components/ContentPermissionPrompt.js to dispatch the permission request to the correct iframe. r=ochameau

b2g/components/ContentPermissionPrompt.js

@@ -420,7 +420,24 @@ ContentPermissionPrompt.prototype = {
     if (isApp) {
       details.manifestURL = DOMApplicationRegistry.getManifestURLByLocalId(principal.appId);
     }
-    SystemAppProxy.dispatchEvent(details);
+
+    // request.element is defined for OOP content, while request.window
+    // is defined for In-Process content.
+    // In both cases the message needs to be dispatched to the top-level
+    // <iframe mozbrowser> container in the system app.
+    // So the above code iterates over window.realFrameElement in order
+    // to crosss mozbrowser iframes boundaries and find the top-level
+    // one in the system app.
+    // window.realFrameElement will be |null| if the code try to cross
+    // content -> chrome boundaries.
+    let targetElement = request.element;
+    let targetWindow = request.window || targetElement.ownerDocument.defaultView;
+    while (targetWindow.realFrameElement) {
+      targetElement = targetWindow.realFrameElement;
+      targetWindow = targetElement.ownerDocument.defaultView;
+    }
+
+    SystemAppProxy.dispatchEvent(details, targetElement);
   },
 
   classID: Components.ID("{8c719f03-afe0-4aac-91ff-6c215895d467}"),

b2g/components/SystemAppProxy.jsm

@@ -58,7 +58,10 @@ let SystemAppProxy = {
    *   @param noPending Set to true to emit this event even before the system
    *                    app is ready.
    */
-  _sendCustomEvent: function systemApp_sendCustomEvent(type, details, noPending) {
+  _sendCustomEvent: function systemApp_sendCustomEvent(type,
+                                                       details,
+                                                       noPending,
+                                                       target) {
     let content = this._frame ? this._frame.contentWindow : null;
 
     // If the system app isn't ready yet,
@@ -80,14 +83,14 @@ let SystemAppProxy = {
     }
 
     event.initCustomEvent(type, true, false, payload);
-    content.dispatchEvent(event);
+    (target || content).dispatchEvent(event);
 
     return event;
   },
 
   // Now deprecated, use sendCustomEvent with a custom event name
-  dispatchEvent: function systemApp_sendChromeEvent(details) {
-    return this._sendCustomEvent('mozChromeEvent', details);
+  dispatchEvent: function systemApp_sendChromeEvent(details, target) {
+    return this._sendCustomEvent('mozChromeEvent', details, false, target);
   },
 
   // Listen for dom events on the system app

b2g/components/test/mochitest/systemapp_helper.js

@@ -8,6 +8,7 @@ Services.scriptloader.loadSubScript("resource://gre/modules/SystemAppProxy.jsm",
 const { SystemAppProxy } = scope;
 
 let frame;
+let customEventTarget;
 
 let index = -1;
 function next() {
@@ -47,6 +48,10 @@ function listener(event) {
   } else if (n == 4) {
     assert.equal(event.type, "mozChromeEvent");
     assert.equal(event.detail.name, "fourth");
+  } else if (n == 5) {
+    assert.equal(event.type, "custom");
+    assert.equal(event.detail.name, "fifth");
+    assert.equal(event.target, customEventTarget);
 
     next(); // call checkEventListening();
   } else {
@@ -79,6 +84,8 @@ let steps = [
     frame = doc.createElement("iframe");
     doc.documentElement.appendChild(frame);
 
+    customEventTarget = frame.contentDocument.body;
+
     // Ensure that events are correctly sent to the frame.
     // `listener` is going to call next()
     frame.contentWindow.addEventListener("mozChromeEvent", listener);
@@ -118,7 +125,8 @@ let steps = [
     // they should be dispatched right away
     SystemAppProxy._sendCustomEvent("custom", { name: "third" });
     SystemAppProxy.dispatchEvent({ name: "fourth" });
-    // Once this 4th event is received, we will run checkEventListening
+    SystemAppProxy._sendCustomEvent("custom", { name: "fifth" }, false, customEventTarget);
+    // Once this 5th event is received, we will run checkEventListening
   },
 
   function checkEventListening() {