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

Source/core/events/MessageEvent.h

Index: Source/core/events/MessageEvent.h
diff --git a/Source/core/events/MessageEvent.h b/Source/core/events/MessageEvent.h
index 28558b1227c413e4c0401839f90c0b1e4244fffe..f06f5a0ee2b4ec1221d5a392618e1b89c047c157 100644
--- a/Source/core/events/MessageEvent.h
+++ b/Source/core/events/MessageEvent.h
@@ -116,6 +116,7 @@ public:
     virtual void trace(Visitor*) OVERRIDE;
 
     virtual v8::Handle<v8::Object> wrap(v8::Handle<v8::Object> creationContext, v8::Isolate*) OVERRIDE;
+    v8::Handle<v8::Object> associateWithWrapper(const WrapperTypeInfo*, v8::Handle<v8::Object> wrapper, v8::Isolate*);
 
 private:
     MessageEvent();
@@ -128,6 +129,8 @@ private:
     MessageEvent(PassRefPtrWillBeRawPtr<Blob> data, const String& origin);
     MessageEvent(PassRefPtr<ArrayBuffer> data, const String& origin);
 
+    v8::Handle<v8::Object> associateWithWrapperInternal(v8::Handle<v8::Object> wrapper, v8::Isolate*);
+
     DataType m_dataType;
     RefPtr<SerializedScriptValue> m_dataAsSerializedScriptValue;
     String m_dataAsString;