Less strict checked state changes and introduce disabled state for content

chrome/browser/resources/chromeos/chromevox/cvox2/background/background_test.extjs

 // 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(['../../testing/chromevox_next_e2e_test_base.js',
              '../../testing/assert_additions.js']);
 
 GEN_INCLUDE(['../../testing/mock_feedback.js']);
 
@@ skipping 974 matching lines @@
         .call(doCmd('nextCharacter'))
         .expectSpeech('i', 'selected')
         .call(doCmd('previousCharacter'))
         .expectSpeech('i', 'unselected')
         .call(doCmd('nextCharacter'))
         .call(doCmd('nextCharacter'))
         .expectSpeech('End selection', 'sim')
         .replay();
   });
 });
+
+TEST_F('BackgroundTest', 'DisabledState', function() {
+  var mockFeedback = this.createMockFeedback();
+  this.runWithLoadedTree(function(root) {/*!
+    <button aria-disabled="true">ok</button>
+  */}, function(root) {
+    mockFeedback.expectSpeech('ok', 'Disabled', 'Button').replay();
+  });
+});