Set a bit on Custom Elements on creation to simplify wrapping

Source/core/dom/CustomElementRegistry.h

 /*
  * Copyright (C) 2012 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 61 matching lines @@
     public:
         CallbackDeliveryScope() { }
         ~CallbackDeliveryScope() { CustomElementRegistry::deliverAllLifecycleCallbacksIfNeeded(); }
     };
 
     explicit CustomElementRegistry(Document*);
     ~CustomElementRegistry();
 
     PassRefPtr<CustomElementConstructor> registerElement(WebCore::ScriptState*, const AtomicString& name, const Dictionary& options, ExceptionCode&);
 
-    // FIXME: findFor is dangerous since it consults the "is"
-    // attribute; that should only be consulted at element creation
-    // time.
     PassRefPtr<CustomElementDefinition> findFor(Element*) const;
     PassRefPtr<CustomElementDefinition> findAndCheckNamespace(const AtomicString& type, const AtomicString& namespaceURI) const;
 
     PassRefPtr<Element> createCustomTagElement(const QualifiedName& localName);
 
     Document* document() const;
 
     void didGiveTypeExtension(Element*);
 
     static bool isCustomTagName(const AtomicString& name) { return isValidName(name); }
@@ skipping 29 matching lines @@
 inline CustomElementRegistry::InstanceSet& CustomElementRegistry::activeCustomElementRegistries()
 {
     DEFINE_STATIC_LOCAL(InstanceSet, activeInstances, ());
     return activeInstances;
 }
 
 
 } // namespace WebCore
 
 #endif