Begin to enable extension APIs in Extension Service Worker.

extensions/browser/extension_service_worker_message_filter.h

Index: extensions/browser/extension_service_worker_message_filter.h
diff --git a/extensions/browser/extension_service_worker_message_filter.h b/extensions/browser/extension_service_worker_message_filter.h
new file mode 100644
index 0000000000000000000000000000000000000000..199ca4415efd086a8ec4b05188d4b903f7864998
--- /dev/null
+++ b/extensions/browser/extension_service_worker_message_filter.h
@@ -0,0 +1,50 @@
+// 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_BROWSER_EXTENSION_SERVICE_WORKER_MESSAGE_FILTER_H_
+#define EXTENSIONS_BROWSER_EXTENSION_SERVICE_WORKER_MESSAGE_FILTER_H_
+
+#include "base/macros.h"
+#include "content/public/browser/browser_message_filter.h"
+
+struct ExtensionHostMsg_Request_Params;
+
+namespace content {
+class BrowserContext;
+}
+
+namespace extensions {
+
+class ExtensionFunctionDispatcher;
+
+// IPC handler class for extension service worker.
+class ExtensionServiceWorkerMessageFilter
+    : public content::BrowserMessageFilter {
+ public:
+  ExtensionServiceWorkerMessageFilter(int render_process_id,
+                                      content::BrowserContext* context);
+
+  // content::BrowserMessageFilter methods:

[Devlin, 2016/04/15 21:06:19]

nit: prefer just
// content::BrowserMessageFilter:

[lazyboy, 2016/04/18 18:42:14]

Done.

+  bool OnMessageReceived(const IPC::Message& message) override;
+  void OverrideThreadForMessage(const IPC::Message& message,
+                                content::BrowserThread::ID* thread) override;
+
+ private:
+  ~ExtensionServiceWorkerMessageFilter() override;
+
+  void OnRequestWorker(const ExtensionHostMsg_Request_Params& params);
+
+  const int render_process_id_;
+  content::BrowserContext* browser_context_;
+
+  std::unique_ptr<ExtensionFunctionDispatcher,
+                  content::BrowserThread::DeleteOnUIThread>
+      dispatcher_;
+
+  DISALLOW_COPY_AND_ASSIGN(ExtensionServiceWorkerMessageFilter);
+};
+
+}  // namespace extensions
+
+#endif  // EXTENSIONS_BROWSER_EXTENSION_SERVICE_WORKER_MESSAGE_FILTER_H_