Start to implement FetchEvent for ServiceWorker

public/web/WebServiceWorkerContextProxy.h

 /*
  * Copyright (C) 2013 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 25 matching lines @@
 class WebString;
 
 // A proxy interface to talk to the worker's GlobalScope implementation.
 // All methods of this class must be called on the worker thread.
 class WebServiceWorkerContextProxy {
 public:
     virtual ~WebServiceWorkerContextProxy() { }
 
     // FIXME: This needs to pass the active service worker info.
     virtual void dispatchInstallEvent(int installEventID) = 0;
+    // FIXME: This needs to pass the fetch request info.
+    virtual void dispatchFetchEvent(int fetchEventID) = 0;
 
     virtual void resumeWorkerContext() { }
     virtual void attachDevTools() { }
     virtual void reattachDevTools(const WebString& savedState) { }
     virtual void detachDevTools() { }
     virtual void dispatchDevToolsMessage(const WebString&) { }
 };
 
 } // namespace blink
 
 #endif // WebServiceWorkerContextProxy_h