Let unresolved custom element go through CustomElementCallbackQueue.

Source/core/dom/custom/CustomElement.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 83 matching lines @@
     RefPtr<CustomElementDefinition> definition(passDefinition);
 
     switch (element->customElementState()) {
     case Element::NotCustomElement:
     case Element::Upgraded:
         ASSERT_NOT_REACHED();
         break;
 
     case Element::WaitingForUpgrade:
         definitions().add(element, definition);
-        CustomElementCallbackScheduler::scheduleCreatedCallback(definition->callbacks(), element);
+        if (element->inDocument() && element->document().domWindow())
+            CustomElementCallbackScheduler::scheduleAttachedCallback(definition->callbacks(), element);
+        definition->callbacks()->created(element);
         break;
     }
 }
 
 CustomElementDefinition* CustomElement::definitionFor(Element* element)
 {
     CustomElementDefinition* definition = definitions().get(element);
     ASSERT(definition);
     return definition;
 }
@@ skipping 42 matching lines @@
     ASSERT_UNUSED(result, result.isNewEntry);
 }
 
 CustomElement::DefinitionMap& CustomElement::definitions()
 {
     DEFINE_STATIC_LOCAL(DefinitionMap, map, ());
     return map;
 }
 
 } // namespace WebCore