Begin to enable extension APIs in Extension Service Worker.

extensions/renderer/service_worker_request_sender.cc

Index: extensions/renderer/service_worker_request_sender.cc
diff --git a/extensions/renderer/service_worker_request_sender.cc b/extensions/renderer/service_worker_request_sender.cc
new file mode 100644
index 0000000000000000000000000000000000000000..6757ff6cfcac8eb44729c22c6db79bebd0063429
--- /dev/null
+++ b/extensions/renderer/service_worker_request_sender.cc
@@ -0,0 +1,35 @@
+// 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.
+
+#include "extensions/renderer/service_worker_request_sender.h"
+
+#include "content/public/child/worker_thread.h"
+#include "extensions/common/extension_messages.h"
+#include "extensions/renderer/worker_thread_dispatcher.h"
+
+namespace extensions {
+
+ServiceWorkerRequestSender::ServiceWorkerRequestSender(
+    WorkerThreadDispatcher* dispatcher,
+    int embedded_worker_id)
+    : RequestSender(nullptr),
+      dispatcher_(dispatcher),
+      embedded_worker_id_(embedded_worker_id) {}
+
+ServiceWorkerRequestSender::~ServiceWorkerRequestSender() {}
+
+void ServiceWorkerRequestSender::SendRequest(
+    content::RenderFrame* render_frame,
+    bool for_io_thread,
+    ExtensionHostMsg_Request_Params& params) {
+  DCHECK(!render_frame && !for_io_thread);
+  int worker_thread_id = content::WorkerThread::GetCurrentId();
+  DCHECK(worker_thread_id > 0);
+  params.worker_thread_id = worker_thread_id;
+  params.embedded_worker_id = embedded_worker_id_;
+
+  dispatcher_->Send(new ExtensionHostMsg_RequestWorker(params));
+}
+
+}  // namespace extensions