Add tests for closing a frame within the scope of a getusermedia callback.

content/test/data/media/webrtc_test_utilities.js

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // These must match with how the video and canvas tags are declared in html.
 const VIDEO_TAG_WIDTH = 320;
 const VIDEO_TAG_HEIGHT = 240;
 
 // Fake video capture background green is of value 135.
 const COLOR_BACKGROUND_GREEN = 135;
 
 // Number of test events to occur before the test pass. When the test pass,
 // the function gAllEventsOccured is called.
 var gNumberOfExpectedEvents = 0;
 
 // Number of events that currently have occurred.
 var gNumberOfEvents = 0;
 
 var gAllEventsOccured = function () {};
 
 // Use this function to set a function that will be called once all expected
 // events has occurred.
 function setAllEventsOccuredHandler(handler) {
   gAllEventsOccured = handler;
 }
 
 // Tells the C++ code we succeeded, which will generally exit the test.
 function reportTestSuccess() {
-  window.domAutomationController.send('OK');
+// This function enqueues sending an OK back to the test, rather than doing

[phoglund_chromium, 2015/04/10 09:58:40]

Nit: indent comments 2 steps.

+// it directly. We do this so we catch crashes that occur in the current
+// execution context, but after reportTestSuccess is invoked.
+  setTimeout(function () {
+    window.domAutomationController.send('OK');
+  }, 0);
 }
 
 // Returns a custom return value to the test.
 function sendValueToTest(value) {
   window.domAutomationController.send(value);
 }
 
 // Immediately fails the test on the C++ side.
 function failTest(reason) {
   var error = new Error(reason);
@@ skipping 181 matching lines @@
     devices.forEach(function(device) {
       if (device.kind == 'video')
         hasVideoInputDevice = true;
     });
 
     if (hasVideoInputDevice)
       sendValueToTest('has-video-input-device');
     else
       sendValueToTest('no-video-input-devices');
   });
-}
+}