Run Mutation Observer and Custom Element callbacks consistently at microtask checkpoint

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 78 matching lines @@
     Document* document() const;
 
     void didGiveTypeExtension(Element*, const AtomicString&);
     void customElementWasDestroyed(Element*);
 
     static bool isCustomTagName(const AtomicString& name) { return isValidName(name); }
 
     static void deliverAllLifecycleCallbacks();
     static void deliverAllLifecycleCallbacksIfNeeded();
 
+    static bool hasQueuedLifecycleCallbacks();
+    static void abandonAllQueuedLifecycleCallbacks();
+    void abandonQueuedLifecycleCallbacks();

[dglazkov, 2013/05/08 16:42:00]

lifecycle callbacks queue is just begging to be its own class, with all these
methods on it.

+
 private:
     typedef HashMap<AtomicString, RefPtr<CustomElementDefinition> > DefinitionMap;
     typedef ListHashSet<CustomElementRegistry*> InstanceSet;
 
     static bool isValidName(const AtomicString&);
 
     static InstanceSet& activeCustomElementRegistries();
     void activate(const CustomElementInvocation&);
     void deactivate();
     void deliverLifecycleCallbacks();
@@ skipping 17 matching lines @@
 inline CustomElementRegistry::InstanceSet& CustomElementRegistry::activeCustomElementRegistries()
 {
     DEFINE_STATIC_LOCAL(InstanceSet, activeInstances, ());
     return activeInstances;
 }
 
 
 } // namespace WebCore
 
 #endif