Begin to enable extension APIs in Extension Service Worker.

extensions/renderer/service_worker_request_sender.h

Index: extensions/renderer/service_worker_request_sender.h
diff --git a/extensions/renderer/service_worker_request_sender.h b/extensions/renderer/service_worker_request_sender.h
new file mode 100644
index 0000000000000000000000000000000000000000..ad22f47c5bf389d1325965ab2403e879e47cf05f
--- /dev/null
+++ b/extensions/renderer/service_worker_request_sender.h
@@ -0,0 +1,33 @@
+// Copyright 2016 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef EXTENSIONS_RENDERER_SERVICE_WORKER_REQUEST_SENDER_H_
+#define EXTENSIONS_RENDERER_SERVICE_WORKER_REQUEST_SENDER_H_
+
+#include "extensions/renderer/request_sender.h"
+
+namespace extensions {
+class WorkerThreadDispatcher;
+
+// A RequestSender variant for Extension Service Worker.
+class ServiceWorkerRequestSender : public RequestSender {
+ public:
+  ServiceWorkerRequestSender(WorkerThreadDispatcher* dispatcher,
+                             int embedded_worker_id);
+  ~ServiceWorkerRequestSender() override;
+
+  void SendRequest(content::RenderFrame* render_frame,
+                   bool for_io_thread,
+                   ExtensionHostMsg_Request_Params& params) override;
+
+ private:
+  WorkerThreadDispatcher* const dispatcher_;
+  const int embedded_worker_id_;
+
+  DISALLOW_COPY_AND_ASSIGN(ServiceWorkerRequestSender);
+};
+
+}  // namespace extensions
+
+#endif  // EXTENSIONS_RENDERER_SERVICE_WORKER_REQUEST_SENDER_H_