Make ServiceWorkerDispatcher reuse existing WebServiceWorkerImpls.

content/child/service_worker/web_service_worker_impl.h

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CONTENT_CHILD_SERVICE_WORKER_WEB_SERVICE_WORKER_IMPL_H_
 #define CONTENT_CHILD_SERVICE_WORKER_WEB_SERVICE_WORKER_IMPL_H_
 
 #include <vector>
 
 #include "base/compiler_specific.h"
@@ skipping 17 matching lines @@
 // is held by ServiceWorker object in blink's c++ layer, e.g. created one
 // per navigator.serviceWorker.current or per successful
 // navigator.serviceWorker.register call.
 //
 // Each instance holds one ServiceWorkerHandleReference so that
 // corresponding ServiceWorkerHandle doesn't go away in the browser process
 // while the ServiceWorker object is alive.
 class WebServiceWorkerImpl
     : NON_EXPORTED_BASE(public blink::WebServiceWorker) {
  public:
-  WebServiceWorkerImpl(const ServiceWorkerObjectInfo& info,
-                       ThreadSafeSender* thread_safe_sender);
   WebServiceWorkerImpl(scoped_ptr<ServiceWorkerHandleReference> handle_ref,
                        ThreadSafeSender* thread_safe_sender);
   virtual ~WebServiceWorkerImpl();
 
   // Notifies that the service worker's state changed. This function may queue
   // the state change for later processing, if the proxy is not yet ready to
   // handle state changes.
   void OnStateChanged(blink::WebServiceWorkerState new_state);
 
   virtual void setProxy(blink::WebServiceWorkerProxy* proxy);
+  virtual blink::WebServiceWorkerProxy* proxy();
   virtual void proxyReadyChanged();
   virtual blink::WebURL scope() const;
   virtual blink::WebURL url() const;
   virtual blink::WebServiceWorkerState state() const;
   virtual void postMessage(const blink::WebString& message,
                            blink::WebMessagePortChannelArray* channels);
 
  private:
   // Commits the new state internally and notifies the proxy of the change.
   void ChangeState(blink::WebServiceWorkerState new_state);
 
   scoped_ptr<ServiceWorkerHandleReference> handle_ref_;
   blink::WebServiceWorkerState state_;
   scoped_refptr<ThreadSafeSender> thread_safe_sender_;
   blink::WebServiceWorkerProxy* proxy_;
   std::vector<blink::WebServiceWorkerState> queued_states_;
 
   DISALLOW_COPY_AND_ASSIGN(WebServiceWorkerImpl);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_CHILD_SERVICE_WORKER_WEB_SERVICE_WORKER_IMPL_H_