Let unresolved custom element go through CustomElementCallbackQueue.

Source/core/dom/custom/CustomElementCallbackScheduler.h

 /*
  * 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 21 matching lines @@
 #define CustomElementCallbackScheduler_h
 
 #include "core/dom/custom/CustomElementCallbackQueue.h"
 #include "wtf/HashMap.h"
 #include "wtf/OwnPtr.h"
 #include "wtf/PassRefPtr.h"
 #include "wtf/text/AtomicString.h"
 
 namespace WebCore {
 
+class CustomElementDescriptor;
 class CustomElementLifecycleCallbacks;
+class CustomElementPendingImport;
 class Element;
 
 class CustomElementCallbackScheduler {
 public:
     static void scheduleAttributeChangedCallback(PassRefPtr<CustomElementLifecycleCallbacks>, PassRefPtr<Element>, const AtomicString& name, const AtomicString& oldValue, const AtomicString& newValue);
-    static void scheduleCreatedCallback(PassRefPtr<CustomElementLifecycleCallbacks>, PassRefPtr<Element>);
     static void scheduleAttachedCallback(PassRefPtr<CustomElementLifecycleCallbacks>, PassRefPtr<Element>);
     static void scheduleDetachedCallback(PassRefPtr<CustomElementLifecycleCallbacks>, PassRefPtr<Element>);
+    static void scheduleResolutionStep(const CustomElementDescriptor&, PassRefPtr<Element>);
 
 protected:
     friend class CustomElementCallbackDispatcher;
     static void clearElementCallbackQueueMap();
 
 private:
     CustomElementCallbackScheduler() { }
 
     static CustomElementCallbackScheduler& instance();
 
     CustomElementCallbackQueue* ensureCallbackQueue(PassRefPtr<Element>);
     CustomElementCallbackQueue* schedule(PassRefPtr<Element>);
     CustomElementCallbackQueue* scheduleInCurrentElementQueue(PassRefPtr<Element>);
 
     typedef HashMap<Element*, OwnPtr<CustomElementCallbackQueue> > ElementCallbackQueueMap;
     ElementCallbackQueueMap m_elementCallbackQueueMap;
 };
 
 }
 
 #endif // CustomElementCallbackScheduler_h