[WIP] off-main-thread loading

content/renderer/renderer_blink_platform_impl.cc

Index: content/renderer/renderer_blink_platform_impl.cc
diff --git a/content/renderer/renderer_blink_platform_impl.cc b/content/renderer/renderer_blink_platform_impl.cc
index 23379f467fdaf1e36dd459afd3f054ee1739b773..aca353f60b0b2a69c22792191a9739f2d8040a26 100644
--- a/content/renderer/renderer_blink_platform_impl.cc
+++ b/content/renderer/renderer_blink_platform_impl.cc
@@ -8,6 +8,7 @@
 #include <utility>
 
 #include "base/command_line.h"
+#include "base/feature_list.h"
 #include "base/files/file_path.h"
 #include "base/guid.h"
 #include "base/lazy_instance.h"
@@ -41,6 +42,8 @@
 #include "content/common/file_utilities_messages.h"
 #include "content/common/frame_messages.h"
 #include "content/common/render_process_messages.h"
+#include "content/common/worker_fetch_context_factory.mojom.h"
+#include "content/public/common/content_features.h"
 #include "content/public/common/content_switches.h"
 #include "content/public/common/service_manager_connection.h"
 #include "content/public/common/webplugininfo.h"
@@ -67,6 +70,7 @@
 #include "content/renderer/mojo/blink_interface_provider_impl.h"
 #include "content/renderer/render_thread_impl.h"
 #include "content/renderer/renderer_clipboard_delegate.h"
+#include "content/renderer/service_worker/worker_fetch_context_info_impl.h"
 #include "content/renderer/webclipboard_impl.h"
 #include "content/renderer/webgraphicscontext3d_provider_impl.h"
 #include "content/renderer/webpublicsuffixlist_impl.h"
@@ -427,6 +431,17 @@ void RendererBlinkPlatformImpl::cacheMetadataInCacheStorage(
           cacheStorageOrigin, cacheStorageCacheName.utf8()));
 }
 
+std::unique_ptr<blink::WebWorkerFetchContextInfo>
+RendererBlinkPlatformImpl::createWorkerFetchContextInfo() {
+  if (!base::FeatureList::IsEnabled(features::kOffMainThreadFetch))
+    return nullptr;
+  mojom::WorkerFetchContextFactoryPtr worker_fetch_context_factory;
+  interfaceProvider()->getInterface(
+      mojo::MakeRequest(&worker_fetch_context_factory));
+  return base::MakeUnique<WorkerFetchContextInfoImpl>(
+      worker_fetch_context_factory.PassInterface());
+}
+
 WebString RendererBlinkPlatformImpl::defaultLocale() {
   return WebString::fromASCII(RenderThread::Get()->GetLocale());
 }