Implemented IAccessible2 reverse relations.

third_party/WebKit/Source/web/WebAXObject.cpp

 /*
  * Copyright (C) 2009 Google 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:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 582 matching lines @@
 }
 
 WebString WebAXObject::liveRegionStatus() const
 {
     if (isDetached())
         return WebString();
 
     return m_private->liveRegionStatus();
 }
 
+WebAXObject WebAXObject::liveRegionRoot() const
+{
+    if (isDetached())
+        return WebAXObject();
+
+    AXObject* liveRegionRoot = m_private->liveRegionRoot();
+    if (liveRegionRoot)
+        return WebAXObject(liveRegionRoot);
+    return WebAXObject();
+}
+
 bool WebAXObject::containerLiveRegionAtomic() const
 {
     if (isDetached())
         return false;
 
     return m_private->containerLiveRegionAtomic();
 }
 
 bool WebAXObject::containerLiveRegionBusy() const
 {
@@ skipping 974 matching lines @@
     m_private = object;
     return *this;
 }
 
 WebAXObject::operator AXObject*() const
 {
     return m_private.get();
 }
 
 } // namespace blink