Track all changed nodes during an update

chrome/browser/resources/chromeos/chromevox/testing/chromevox_next_e2e_test_base.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.
 
 // Include test fixture.
 GEN_INCLUDE(['chromevox_e2e_test_base.js']);
 
 /**
  * Base test fixture for ChromeVox Next end to end tests.
  *
  * These tests are identical to ChromeVoxE2ETests except for performing the
  * necessary setup to run ChromeVox Next.
  * @constructor
  * @extends {ChromeVoxE2ETest}
  */
 function ChromeVoxNextE2ETest() {
   ChromeVoxE2ETest.call(this);
 
   if (this.runtimeDeps.length > 0) {
     chrome.extension.getViews().forEach(function(w) {
       this.runtimeDeps.forEach(function(dep) {
         if (w[dep])
           window[dep] = w[dep];
       }.bind(this));
     }.bind(this));
   }
+
+  // For tests, enable announcement of events we trigger via automation.
+  DesktopAutomationHandler.announceActions = true;
 }
 
 ChromeVoxNextE2ETest.prototype = {
   __proto__: ChromeVoxE2ETest.prototype,
 
   /**
    * Dependencies defined on a background window other than this one.
    * @type {!Array<string>}
    */
   runtimeDeps: [],
@@ skipping 35 matching lines @@
   },
 
   listenOnce: function(node, eventType, callback, capture) {
     var innerCallback = this.newCallback(function() {
       node.removeEventListener(eventType, innerCallback, capture);
       callback.apply(this, arguments);
     });
     node.addEventListener(eventType, innerCallback, capture);
   }
 };