Run Mutation Observer and Custom Element callbacks consistently at microtask checkpoint

Source/core/dom/CustomElementRegistry.h

Index: Source/core/dom/CustomElementRegistry.h
diff --git a/Source/core/dom/CustomElementRegistry.h b/Source/core/dom/CustomElementRegistry.h
index 9ae6c860919184d5bc957b06984403d039ef6b66..13f2b092570400295025637680ccaa6800c533de 100644
--- a/Source/core/dom/CustomElementRegistry.h
+++ b/Source/core/dom/CustomElementRegistry.h
@@ -96,6 +96,10 @@ public:
     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;