Ensure WebView notifies desktop automation on creation, destruction, and change

chrome/browser/resources/chromeos/chromevox/testing/mock_tts.js

 // Copyright 2014 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.
 
 /**
  * Mock tts class.
  * @constructor
  * @extends {cvox.TtsInterface}
  */
 var MockTts = function() {
@@ skipping 95 matching lines @@
       if (opt_exact)
         return actualText === expectedText;
       return actualText.indexOf(expectedText) != -1;
     };
 
     this.expectations_.push(expectation);
 
     // Process any idleUtterances.
     this.idleUtterances_.forEach(function(utterance) {
       this.process_(utterance, true);
-    });
+    }.bind(this));
   },
 
   /**
    * @param {string} textString Utterance to match against callbacks.
    * @param {boolean=} opt_manual True if called outside of tts.speak.
    * @private
    */
   process_: function(textString, opt_manual) {
     if (this.expectations_.length == 0) {
       if (!opt_manual)
         this.idleUtterances_.push(textString);
       return;
     }
 
     var allUtterances = this.idleUtterances_.concat([textString]);
     var targetExpectation = this.expectations_.shift();
     if (allUtterances.some(targetExpectation.predicate)) {
       this.idleUtterances_.length = 0;
       if (targetExpectation.endCallback)
         targetExpectation.endCallback();
       var nextExpectation = this.expectations_[0];
       if (nextExpectation && nextExpectation.startCallback)
         nextExpectation.startCallback();
     } else {
       this.expectations_.unshift(targetExpectation);
     }
   },
 };