bindings: Introduces ScriptWrappable::associateWithWrapper in addition to wrap.

Source/core/events/MessageEvent.cpp

Index: Source/core/events/MessageEvent.cpp
diff --git a/Source/core/events/MessageEvent.cpp b/Source/core/events/MessageEvent.cpp
index 46b1ce3d53d08c39bd6fb27f38aef9de2d276906..370f20741ca57304a0e0868791085474d4faab84 100644
--- a/Source/core/events/MessageEvent.cpp
+++ b/Source/core/events/MessageEvent.cpp
@@ -190,7 +190,17 @@ void MessageEvent::trace(Visitor* visitor)
 v8::Handle<v8::Object> MessageEvent::wrap(v8::Handle<v8::Object> creationContext, v8::Isolate* isolate)
 {
     v8::Handle<v8::Object> wrapper = Event::wrap(creationContext, isolate);
+    return associateWithWrapperInternal(wrapper, isolate);
+}
 
+v8::Handle<v8::Object> MessageEvent::associateWithWrapper(const WrapperTypeInfo* wrapperType, v8::Handle<v8::Object> wrapper, v8::Isolate* isolate)
+{
+    Event::associateWithWrapper(wrapperType, wrapper, isolate);
+    return associateWithWrapperInternal(wrapper, isolate);
+}
+
+v8::Handle<v8::Object> MessageEvent::associateWithWrapperInternal(v8::Handle<v8::Object> wrapper, v8::Isolate* isolate)
+{
     // Ensures a wrapper is created for the data to return now so that V8 knows how
     // much memory is used via the wrapper. To keep the wrapper alive, it's set to
     // the wrapper of the MessageEvent as a hidden value.