history: add a browser test for confirm dialog focus regression.

chrome/browser/resources/history/history.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.
 
 <include src="../uber/uber_utils.js">
 <include src="history_focus_manager.js">
 
 ///////////////////////////////////////////////////////////////////////////////
 // Globals:
 /** @const */ var RESULTS_PER_PAGE = 150;
@@ skipping 1958 matching lines @@
   chrome.send('clearBrowsingData');
 }
 
 /**
  * Shows the dialog for the user to confirm removal of selected history entries.
  */
 function showConfirmationOverlay() {
   $('alertOverlay').classList.add('showing');
   $('overlay').hidden = false;
   $('alertOverlayCancel').focus();
+  $('history-page').setAttribute('aria-hidden', 'true');

[Evan Stade, 2014/09/23 20:46:30]

is this related to the CL desc?

[Dan Beam, 2014/09/23 20:48:42]

yeah, because it's required to pass the browser tests (a11y audit is on)

   uber.invokeMethodOnParent('beginInterceptingEvents');
 }
 
 /**
  * Hides the confirmation overlay used to confirm selected history entries.
  */
 function hideConfirmationOverlay() {
   $('alertOverlay').classList.remove('showing');
   $('overlay').hidden = true;
+  $('history-page').removeAttribute('aria-hidden');
   uber.invokeMethodOnParent('stopInterceptingEvents');
 }
 
 /**
  * Shows the confirmation alert for history deletions and permits browser tests
  * to override the dialog.
  * @param {function()=} okCallback A function to be called when the user presses
  *     the ok button.
  * @param {function()=} cancelCallback A function to be called when the user
  *     presses the cancel button.
@@ skipping 269 matching lines @@
     historyView.reload();
 }
 
 // Add handlers to HTML elements.
 document.addEventListener('DOMContentLoaded', load);
 
 // This event lets us enable and disable menu items before the menu is shown.
 document.addEventListener('canExecute', function(e) {
   e.canExecute = true;
 });