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..49a1456172a361cbcf63a4852d7ebae3259d9d48 100644
--- a/third_party/WebKit/Source/platform/loader/fetch/ResourceFetcher.h
+++ b/third_party/WebKit/Source/platform/loader/fetch/ResourceFetcher.h
@@ -171,6 +171,14 @@ class PLATFORM_EXPORT ResourceFetcher
       FetchRequest::DeferOption = FetchRequest::NoDefer,
       bool forPreload = false);
 
+  enum PrepareRequestResult { Abort, Continue, Block };
+
+  PrepareRequestResult prepareRequest(FetchRequest&,
+                                      const ResourceFactory&,
+                                      const SubstituteData&,
+                                      unsigned long identifier,
+                                      ResourceRequestBlockedReason&);
+
   Resource* resourceForStaticData(const FetchRequest&,
                                   const ResourceFactory&,
                                   const SubstituteData&);