Partially implement WorkerFetchContext and WorkerThreadableLoadingContext and add virtual tests

third_party/WebKit/Source/core/loader/ThreadableLoader.cpp

 /*
  * Copyright (C) 2009 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:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 16 matching lines @@
  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
 #include "core/loader/ThreadableLoader.h"
 
 #include "core/dom/Document.h"
 #include "core/dom/ExecutionContext.h"
 #include "core/loader/DocumentThreadableLoader.h"
 #include "core/loader/ThreadableLoadingContext.h"
+#include "core/loader/WorkerFetchContext.h"
 #include "core/loader/WorkerThreadableLoader.h"
 #include "core/workers/WorkerGlobalScope.h"
+#include "platform/RuntimeEnabledFeatures.h"
 
 namespace blink {
 
 ThreadableLoader* ThreadableLoader::Create(
     ExecutionContext& context,
     ThreadableLoaderClient* client,
     const ThreadableLoaderOptions& options,
     const ResourceLoaderOptions& resource_loader_options) {
   DCHECK(client);
 
   if (context.IsWorkerGlobalScope()) {
+    if (RuntimeEnabledFeatures::offMainThreadFetchEnabled()) {
+      DCHECK(ToWorkerGlobalScope(&context)->GetFetchContext());
+      // TODO(horo): Rename DocumentThreadableLoader. We will use it on the
+      // worker thread when off-main-thread-fetch is enabled.
+      return DocumentThreadableLoader::Create(
+          *ThreadableLoadingContext::Create(*ToWorkerGlobalScope(&context)),
+          client, options, resource_loader_options);
+    }
     return WorkerThreadableLoader::Create(ToWorkerGlobalScope(context), client,
                                           options, resource_loader_options);
   }
 
   return DocumentThreadableLoader::Create(
       *ThreadableLoadingContext::Create(*ToDocument(&context)), client, options,
       resource_loader_options);
 }
 
 void ThreadableLoader::LoadResourceSynchronously(
     ExecutionContext& context,
     const ResourceRequest& request,
     ThreadableLoaderClient& client,
     const ThreadableLoaderOptions& options,
     const ResourceLoaderOptions& resource_loader_options) {
   if (context.IsWorkerGlobalScope()) {
     WorkerThreadableLoader::LoadResourceSynchronously(
         ToWorkerGlobalScope(context), request, client, options,
         resource_loader_options);
     return;
   }
 
   DocumentThreadableLoader::LoadResourceSynchronously(
       ToDocument(context), request, client, options, resource_loader_options);
 }
 
 }  // namespace blink