Fixing accessibility bug with extensions preferences

chrome/browser/ui/webui/extensions/extension_settings_browsertest.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.
 
 // TODO(dbeam): test for loading upacked extensions?
 
 GEN('#include "chrome/browser/ui/webui/extensions/' +
     'extension_settings_browsertest.h"');
 
 // The id of the extension from |InstallGoodExtension|.
@@ skipping 388 matching lines @@
    * @const
    */
   browsePreload: 'chrome://extensions-frame/configureCommands',
 };
 
 TEST_F('SettingsCommandsExtensionSettingsWebUITest', 'testChromeSendHandler',
     function() {
   // Just navigating to the page should trigger the chrome.send().
   var assertOverlayVisible = function() {
     assertTrue($('extension-commands-overlay').classList.contains('showing'));
+    assertEquals($('extension-commands-overlay').getAttribute('aria-hidden'),
+                 'false');
     this.nextStep();
   };
 
   this.steps = [this.waitForPageLoad, assertOverlayVisible, testDone];
   this.nextStep();
 });
 
 TEST_F('SettingsCommandsExtensionSettingsWebUITest', 'extensionSettingsUri',
     function() {
   var closeCommandOverlay = function() {
     assertTrue($('extension-commands-overlay').classList.contains('showing'));
+    assertEquals($('extension-commands-overlay').getAttribute('aria-hidden'),
+                 'false');
     assertEquals(window.location.href,
                  'chrome://extensions-frame/configureCommands');
 
     // Close command overlay.
     $('extension-commands-dismiss').click();
 
     assertFalse($('extension-commands-overlay').classList.contains('showing'));
+    assertEquals($('extension-commands-overlay').getAttribute('aria-hidden'),
+                 'true');
     this.nextStep();
   };
 
   var checkExtensionsUrl = function() {
     // After closing the overlay, the URL shouldn't include commands overlay
     // reference.
     assertEquals(window.location.href, 'chrome://extensions-frame/');
     this.nextStep();
   };
 
@@ skipping 75 matching lines @@
 
   /** @override */
   browsePreload: ExtensionSettingsWebUITest.prototype.browsePreload +
       '?options=' + GOOD_EXTENSION_ID,
 };
 
 TEST_F('OptionsDialogExtensionSettingsWebUITest', 'testAccessibility',
        function() {
   this.emptyTestForAccessibility();
 });