Implement Custom Elements' attributeChangedCallback.

Source/core/dom/CustomElementCallbackQueue.cpp

 /*
  * Copyright (C) 2013 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:
  *
  * 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
@@ skipping 36 matching lines @@
     , m_index(0)
 {
 }
 
 void CustomElementCallbackQueue::processInElementQueue(ElementQueue caller)
 {
     for (; m_index < m_queue.size() && owner() == caller; m_index++) {
         // dispatch() may cause recursion which steals this callback
         // queue and reenters processInQueue. owner() == caller
         // detects this recursion and cedes processing.
-        dispatch(m_queue[m_index]);
+        m_queue[m_index]->dispatch(m_callbacks.get(), m_element.get());
     }
 
-    // FIXME: While there is only one kind of callback, stealing work
-    // is not possible. Remove this when there is a second kind of
-    // callback plus tests for shifting callback queues between
-    // element queues.
-    ASSERT(owner() == caller);
-
     if (owner() == caller && m_index == m_queue.size()) {
         // This processInQueue exhausted the queue; shrink it.
         m_index = 0;
         m_queue.resize(0);
         m_owner = -1;
     }
 }
 
-void CustomElementCallbackQueue::dispatch(const Invocation& which)
-{
-    switch (which) {
-    case CustomElementLifecycleCallbacks::Created:
-        m_callbacks->created(m_element.get());
-        break;
-
-    default:
-        ASSERT_NOT_REACHED();
-    }
-}
-
 } // namespace WebCore