[ServiceWorker] Set FetchRequestMode and handle wasFetchedViaServiceWorker.

Source/core/fetch/ResourceLoader.h

 /*
  * Copyright (C) 2005, 2006, 2011 Apple 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:
  *
  * 1.  Redistributions of source code must retain the above copyright
  *     notice, this list of conditions and the following disclaimer.
  * 2.  Redistributions in binary form must reproduce the above copyright
@@ skipping 101 matching lines @@
 
     OwnPtr<blink::WebURLLoader> m_loader;
     RefPtrWillBeMember<ResourceLoaderHost> m_host;
 
     ResourceRequest m_request;
     ResourceRequest m_originalRequest; // Before redirects.
 
     bool m_notifiedLoadComplete;
 
     bool m_defersLoading;
+    OwnPtr<ResourceRequest> m_fallbackRequest;
     ResourceRequest m_deferredRequest;
     ResourceLoaderOptions m_options;
 
     enum ResourceLoaderState {
         Initialized,
         Finishing,
         Terminated
     };
 
     enum ConnectionState {
@@ skipping 12 matching lines @@
     // Used for sanity checking to make sure we don't experience illegal state
     // transitions.
     ConnectionState m_connectionState;
 
     OwnPtr<RequestCountTracker> m_requestCountTracker;
 };
 
 }
 
 #endif