Start to implement FetchEvent for ServiceWorker

public/web/WebServiceWorkerContextClient.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 19 matching lines @@
 
 #ifndef WebServiceWorkerContextClient_h
 #define WebServiceWorkerContextClient_h
 
 #include "WebWorkerPermissionClientProxy.h"
 
 namespace blink {
 
 class WebString;
 class WebServiceWorkerContextProxy;
+struct WebServiceWorkerFetchResponse;
 
 // This interface is implemented by the client. It is suppoed to be created
 // on the main thread and then passed on to the worker thread to be owned
 // by a newly created WorkerGlobalScope. All methods of this class, except
 // for workerContextFailedToStart(), are called on the worker thread.
 // FIXME: Split this into EmbeddedWorkerContextClient and
 // ServiceWorkerScriptContextClient when we decide to use EmbeddedWorker
 // framework for other implementation (like SharedWorker).
 class WebServiceWorkerContextClient {
 public:
@@ skipping 20 matching lines @@
     virtual void reportException(const WebString& errorMessage, int lineNumber, int columnNumber, const WebString& sourceURL) { }
 
     // Inspector related messages.
     virtual void dispatchDevToolsMessage(const WebString&) { }
     virtual void saveDevToolsAgentState(const WebString&) { }
 
     // ServiceWorker specific method. Called after InstallEvent (dispatched
     // via WebServiceWorkerContextProxy) is handled by the ServiceWorker's
     // script context.
     virtual void didHandleInstallEvent(int installEventID) { }
+
+    // ServiceWorker specific method. Called after FetchEvent is handled by the
+    // ServiceWorker's script context.
+    virtual void didHandleFetchEvent(int fetchEventID, const WebServiceWorkerFetchResponse& response) { }
 };
 
 } // namespace blink
 
 #endif // WebWorkerContextClient_h