Adds AXExpandedChanged for general roles.

third_party/WebKit/Source/core/dom/AXObjectCache.h

 /*
  * Copyright (C) 2003, 2006, 2007, 2008, 2009, 2010, 2011 Apple Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 44 matching lines @@
     enum AXNotification {
         AXActiveDescendantChanged,
         AXAlert,
         AXAriaAttributeChanged,
         AXAutocorrectionOccured,
         AXBlur,
         AXCheckedStateChanged,
         AXChildrenChanged,
         AXClicked,
         AXDocumentSelectionChanged,
+        AXExpandedChanged,
         AXFocusedUIElementChanged,
         AXHide,
         AXHover,
         AXInvalidStatusChanged,
         AXLayoutComplete,
         AXLiveRegionChanged,
         AXLoadComplete,
         AXLocationChanged,
         AXMenuListItemSelected,
         AXMenuListItemUnselected,
@@ skipping 86 matching lines @@
 private:
     explicit ScopedAXObjectCache(Document&);
 
     Persistent<Document> m_document;
     Persistent<AXObjectCache> m_cache;
 };
 
 } // namespace blink
 
 #endif