[NotLanded] Implement the fetching algorithm of the Web Manifest.

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 18 matching lines @@
 
 #ifndef FrameLoaderClient_h
 #define FrameLoaderClient_h
 
 #include "core/dom/IconURL.h"
 #include "core/frame/FrameClient.h"
 #include "core/loader/FrameLoaderTypes.h"
 #include "core/loader/NavigationPolicy.h"
 #include "platform/network/ResourceLoadPriority.h"
 #include "platform/weborigin/Referrer.h"
+#include "public/platform/WebManifestError.h"
 #include "wtf/Forward.h"
 #include "wtf/Vector.h"
 #include <v8.h>
 
 namespace blink {
+class WebApplicationCacheHost;
+class WebApplicationCacheHostClient;
 class WebCookieJar;
 class WebRTCPeerConnectionHandler;
 class WebServiceWorkerProvider;
 class WebServiceWorkerProviderClient;
 class WebSocketHandle;
-class WebApplicationCacheHost;
-class WebApplicationCacheHostClient;
+struct WebManifest;
 }
 
 namespace blink {
 
     class Color;
     class DOMWindowExtension;
     class DOMWrapperWorld;
     class DocumentLoader;
     class Element;
     class FetchRequest;
@@ skipping 160 matching lines @@
 
         virtual PassOwnPtr<blink::WebServiceWorkerProvider> createServiceWorkerProvider() = 0;
 
         virtual SharedWorkerRepositoryClient* sharedWorkerRepositoryClient() { return 0; }
 
         virtual PassOwnPtr<blink::WebApplicationCacheHost> createApplicationCacheHost(blink::WebApplicationCacheHostClient*) = 0;
 
         virtual void didStopAllLoaders() { }
 
         virtual void dispatchDidChangeManifest() { }
+        virtual void dispatchDidLoadManifest(const blink::WebManifest&) { }
+        virtual void dispatchDidFailLoadManifest(blink::WebManifestError) { }
 
         virtual bool isFrameLoaderClientImpl() const { return false; }
     };
 
 } // namespace blink
 
 #endif // FrameLoaderClient_h