Set MessageEvent.source to the newly created port for shared workers' connect events

Source/core/dom/EventTarget.h

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2001 Dirk Mueller (mueller@kde.org)
  * Copyright (C) 2004, 2005, 2006, 2007, 2008 Apple Inc. All rights reserved.
  * Copyright (C) 2006 Alexey Proskuryakov (ap@webkit.org)
  *           (C) 2007, 2008 Nikolas Zimmermann <zimmermann@kde.org>
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
@@ skipping 88 matching lines @@
     class EventTarget {
     public:
         void ref() { refEventTarget(); }
         void deref() { derefEventTarget(); }
 
         virtual const AtomicString& interfaceName() const = 0;
         virtual ScriptExecutionContext* scriptExecutionContext() const = 0;
 
         virtual Node* toNode();
         virtual DOMWindow* toDOMWindow();
+        virtual MessagePort* toMessagePort();
 
         virtual bool addEventListener(const AtomicString& eventType, PassRefPtr<EventListener>, bool useCapture);
         virtual bool removeEventListener(const AtomicString& eventType, EventListener*, bool useCapture);
         virtual void removeAllEventListeners();
         virtual bool dispatchEvent(PassRefPtr<Event>);
         bool dispatchEvent(PassRefPtr<Event>, ExceptionState&); // DOM API
         virtual void uncaughtExceptionInEventHandler();
 
         // Used for legacy "onEvent" attribute APIs.
         bool setAttributeEventListener(const AtomicString& eventType, PassRefPtr<EventListener>, DOMWrapperWorld* isolatedWorld = 0);
@@ skipping 83 matching lines @@
     {
         EventTargetData* d = eventTargetData();
         if (!d)
             return false;
         return d->eventListenerMap.containsCapturing(eventType);
     }
 
 } // namespace WebCore
 
 #endif // EventTarget_h