Implement Custom Elements' attributeChangedCallback.

Source/core/dom/CustomElementCallbackQueue.cpp

Index: Source/core/dom/CustomElementCallbackQueue.cpp
diff --git a/Source/core/dom/CustomElementCallbackQueue.cpp b/Source/core/dom/CustomElementCallbackQueue.cpp
index ae9e8a8e82b309baf48a07cb079b3268bb8fb2c6..168fada2724ef654fdce1915c90937bde969f129 100644
--- a/Source/core/dom/CustomElementCallbackQueue.cpp
+++ b/Source/core/dom/CustomElementCallbackQueue.cpp
@@ -54,15 +54,9 @@ void CustomElementCallbackQueue::processInElementQueue(ElementQueue caller)
         // 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;
@@ -71,16 +65,4 @@ void CustomElementCallbackQueue::processInElementQueue(ElementQueue caller)
     }
 }
 
-void CustomElementCallbackQueue::dispatch(const Invocation& which)
-{
-    switch (which) {
-    case CustomElementLifecycleCallbacks::Created:
-        m_callbacks->created(m_element.get());
-        break;
-
-    default:
-        ASSERT_NOT_REACHED();
-    }
-}
-
 } // namespace WebCore