Make prepareRequest() a separate callback of FetchContext

third_party/WebKit/Source/core/loader/appcache/ApplicationCacheHost.h

Index: third_party/WebKit/Source/core/loader/appcache/ApplicationCacheHost.h
diff --git a/third_party/WebKit/Source/core/loader/appcache/ApplicationCacheHost.h b/third_party/WebKit/Source/core/loader/appcache/ApplicationCacheHost.h
index dd3d3cea695def9a244e5740e2794e3a99befde0..f5b0bbb903e1b565265a735487db96a65e62963e 100644
--- a/third_party/WebKit/Source/core/loader/appcache/ApplicationCacheHost.h
+++ b/third_party/WebKit/Source/core/loader/appcache/ApplicationCacheHost.h
@@ -124,14 +124,16 @@ class ApplicationCacheHost final
   void selectCacheWithoutManifest();
   void selectCacheWithManifest(const KURL& manifestURL);
 
-  void willStartLoadingMainResource(ResourceRequest&);
+  // Annotate request for ApplicationCache. This internally calls
+  // willStartLoadingMainResource if it's for frame resource or
+  // willStartLoadingResource for subresource requests.
+  void willStartLoading(ResourceRequest&);
+
   void didReceiveResponseForMainResource(const ResourceResponse&);
   void mainResourceDataReceived(const char* data, size_t length);
   void finishedLoadingMainResource();
   void failedLoadingMainResource();
 
-  void willStartLoadingResource(ResourceRequest&);
-
   Status getStatus() const;
   bool update();
   bool swapCache();
@@ -157,6 +159,9 @@ class ApplicationCacheHost final
  private:
   explicit ApplicationCacheHost(DocumentLoader*);
 
+  void willStartLoadingMainResource(ResourceRequest&);
+  void willStartLoadingResource(ResourceRequest&);
+
   // WebApplicationCacheHostClient implementation
   void didChangeCacheAssociation() final;
   void notifyEventListener(WebApplicationCacheHost::EventID) final;