Make 'any'-typed attributes of events available in isolated worlds

Source/core/dom/MessageEvent.h

Index: Source/core/dom/MessageEvent.h
diff --git a/Source/core/dom/MessageEvent.h b/Source/core/dom/MessageEvent.h
index 80965bfbf0f229ad46a1de4a2df4b59525aeddb8..7fbab49ce756321c9056d11acfd0bd1d9ac2d990 100644
--- a/Source/core/dom/MessageEvent.h
+++ b/Source/core/dom/MessageEvent.h
@@ -98,11 +98,13 @@ public:
         DataTypeArrayBuffer
     };
     DataType dataType() const { return m_dataType; }
-    SerializedScriptValue* dataAsSerializedScriptValue() const { ASSERT(m_dataType == DataTypeSerializedScriptValue); return m_dataAsSerializedScriptValue.get(); }
+    SerializedScriptValue* dataAsSerializedScriptValue() const { ASSERT(m_dataType == DataTypeScriptValue || m_dataType == DataTypeSerializedScriptValue); return m_dataAsSerializedScriptValue.get(); }
     String dataAsString() const { ASSERT(m_dataType == DataTypeString); return m_dataAsString; }
     Blob* dataAsBlob() const { ASSERT(m_dataType == DataTypeBlob); return m_dataAsBlob.get(); }
     ArrayBuffer* dataAsArrayBuffer() const { ASSERT(m_dataType == DataTypeArrayBuffer); return m_dataAsArrayBuffer.get(); }
 
+    void setSerializedData(PassRefPtr<SerializedScriptValue> data) { m_dataAsSerializedScriptValue = data; }
+
 private:
     MessageEvent();
     MessageEvent(const AtomicString&, const MessageEventInit&);