Implement Custom Elements' entered and left document callbacks.

Source/bindings/v8/custom/V8NodeCustom.cpp

 /*
  * Copyright (C) 2007-2009 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:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 111 matching lines @@
         return;
     }
     v8SetReturnValueNull(args);
 }
 
 // This function is customized to take advantage of the optional 4th argument: AttachBehavior
 void V8Node::appendChildMethodCustom(const v8::FunctionCallbackInfo<v8::Value>& args)
 {
     v8::Handle<v8::Object> holder = args.Holder();
     Node* imp = V8Node::toNative(holder);
+
+    CustomElementCallbackDispatcher::CallbackDeliveryScope deliveryScope;
+
     ExceptionCode ec = 0;
     Node* newChild = V8Node::HasInstance(args[0], args.GetIsolate(), worldType(args.GetIsolate())) ? V8Node::toNative(v8::Handle<v8::Object>::Cast(args[0])) : 0;
     bool success = imp->appendChild(newChild, ec, AttachLazily);
     if (ec) {
         setDOMException(ec, args.GetIsolate());
         return;
     }
     if (success) {
         v8SetReturnValue(args, args[0]);
         return;
@@ skipping 33 matching lines @@
             return wrap(toShadowRoot(impl), creationContext, isolate);
         return wrap(static_cast<DocumentFragment*>(impl), creationContext, isolate);
     case Node::NOTATION_NODE:
         return wrap(static_cast<Notation*>(impl), creationContext, isolate);
     default:
         break; // ENTITY_REFERENCE_NODE or XPATH_NAMESPACE_NODE
     }
     return V8Node::createWrapper(impl, creationContext, isolate);
 }
 } // namespace WebCore