Fix ChromeVox's detection of whether the current document has focus.

chrome/browser/resources/chromeos/chromevox/host/interface/abstract_host.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.
 
 /**
  * @fileoverview Abstract interface to methods that differ depending on the
  * host platform.
  *
  */
 
@@ skipping 125 matching lines @@
   if (active == cvox.ChromeVox.isActive) {
     return;
   }
   cvox.ChromeVoxEventWatcher.cleanup(window);
   switch (state) {
     case cvox.AbstractHost.State.ACTIVE:
       cvox.ChromeVox.isActive = true;
       cvox.ChromeVox.navigationManager.showOrHideIndicator(true);
       cvox.ChromeVoxEventWatcher.init(window);
       if (document.activeElement) {
-        var speakNodeAlso = document.hasFocus() && !document.webkitHidden;
+        var speakNodeAlso = cvox.ChromeVox.documentHasFocus();
         cvox.ApiImplementation.syncToNode(
             document.activeElement, speakNodeAlso);
       } else {
         cvox.ChromeVox.navigationManager.updateIndicator();
       }
       break;
     case cvox.AbstractHost.State.INACTIVE:
       cvox.ChromeVox.isActive = false;
       cvox.ChromeVox.navigationManager.showOrHideIndicator(false);
       // If ChromeVox is inactive, the event watcher will only listen for key
       // down events.
       cvox.ChromeVoxEventWatcher.init(window);
       break;
     case cvox.AbstractHost.State.KILLED:
       cvox.ChromeVox.isActive = false;
       cvox.ChromeVox.navigationManager.showOrHideIndicator(false);
       break;
   }
 };