Split requestResource into request preparation and loading

third_party/WebKit/Source/platform/loader/fetch/ResourceFetcher.h

Index: third_party/WebKit/Source/platform/loader/fetch/ResourceFetcher.h
diff --git a/third_party/WebKit/Source/platform/loader/fetch/ResourceFetcher.h b/third_party/WebKit/Source/platform/loader/fetch/ResourceFetcher.h
index bfe2ae9c4937250cfbaad225fa0d67aba7496598..4ab06ef8e718826bd6bf766ed9c408dd16ed6300 100644
--- a/third_party/WebKit/Source/platform/loader/fetch/ResourceFetcher.h
+++ b/third_party/WebKit/Source/platform/loader/fetch/ResourceFetcher.h
@@ -171,6 +171,12 @@ class PLATFORM_EXPORT ResourceFetcher
       FetchRequest::DeferOption = FetchRequest::NoDefer,
       bool forPreload = false);
 
+  bool prepareRequest(FetchRequest&,
+                      const ResourceFactory&,
+                      const SubstituteData&,
+                      unsigned long identifier,
+                      Resource*&);
+
   Resource* resourceForStaticData(const FetchRequest&,
                                   const ResourceFactory&,
                                   const SubstituteData&);