Ensure only one instance of AutomationInternalCustomBindings for background page extensions

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

 // Copyright 2015 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.
 
 /**
  * @fileoverview This file contains the |MockFeedback| class which is
  * a combined mock class for speech, braille, and earcon feedback.  A
  * test that uses this class may add expectations for speech
  * utterances, braille display content to be output, and earcons
  * played (by name).  The |install| method sets appropriate mock
@@ skipping 319 matching lines @@
     return this.lastMatchedBraille_;
   },
 
   /**
    * @param {string} textString
    * @param {cvox.QueueMode} queueMode
    * @param {Object=} properties
    * @private
    */
   addUtterance_: function(textString, queueMode, properties) {
+    console.log('speak!'+textString);
     var callback;
     if (properties && (properties.startCallback || properties.endCallback)) {
       var startCallback = properties.startCallback;
       var endCallback = properties.endCallback;
       callback = function() {
         startCallback && startCallback();
         endCallback && endCallback();
       };
     }
     this.pendingUtterances_.push(
@@ skipping 103 matching lines @@
   }
   if (candidate) {
     var consumed = pending.splice(0, i + 1);
     consumed.forEach(function(item) {
       if (item.callback)
         item.callback();
     });
   }
   return candidate;
 };