Implement support for link type serviceworker in link elements.

third_party/WebKit/Source/core/loader/FrameLoaderClient.h

 /*
  * Copyright (C) 2006, 2007, 2008, 2009, 2010, 2011, 2012 Apple Inc. All rights reserved.
  * Copyright (C) 2012 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:
  *
  * 1.  Redistributions of source code must retain the above copyright
  *     notice, this list of conditions and the following disclaimer.
@@ skipping 17 matching lines @@
  */
 
 #ifndef FrameLoaderClient_h
 #define FrameLoaderClient_h
 
 #include "core/CoreExport.h"
 #include "core/dom/Document.h"
 #include "core/dom/IconURL.h"
 #include "core/fetch/ResourceLoaderOptions.h"
 #include "core/frame/FrameClient.h"
+#include "core/html/LinkResource.h"
 #include "core/loader/FrameLoaderTypes.h"
 #include "core/loader/NavigationPolicy.h"
 #include "platform/heap/Handle.h"
 #include "platform/network/ResourceLoadPriority.h"
 #include "platform/weborigin/Referrer.h"
 #include "public/platform/WebMediaPlayer.h"
 #include "wtf/Forward.h"
 #include "wtf/Vector.h"
 #include <v8.h>
 
@@ skipping 200 matching lines @@
 
     // Called when elements preventing the sudden termination of the frame
     // become present or stop being present. |type| is the type of element
     // (BeforeUnload handler, Unload handler).
     enum SuddenTerminationDisablerType {
         BeforeUnloadHandler,
         UnloadHandler,
     };
     virtual void suddenTerminationDisablerChanged(bool present, SuddenTerminationDisablerType) { }
 
+    virtual PassOwnPtrWillBeRawPtr<LinkResource> createServiceWorkerLinkResource(HTMLLinkElement*) { return nullptr; }
 };
 
 } // namespace blink
 
 #endif // FrameLoaderClient_h