Add skeleton implementation of ExtensionPushMessagingEventRouter.

chrome/browser/extensions/api/push_messaging/push_messaging_api.h

+// Copyright (c) 2012 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 CHROME_BROWSER_EXTENSIONS_API_PUSH_MESSAGING_PUSH_MESSAGING_API_H__
+#define CHROME_BROWSER_EXTENSIONS_API_PUSH_MESSAGING_PUSH_MESSAGING_API_H__
+
+#include <string>
+#include "base/basictypes.h"
+#include "base/compiler_specific.h"
+#include "base/gtest_prod_util.h"
+#include "chrome/browser/extensions/api/push_messaging/invalidation_handler_observer.h"
+
+class Profile;
+
+namespace extensions {
+
+// Observes a single InvalidationHandler and generates onMessage events.
+class PushMessagingEventRouter : public InvalidationHandlerObserver {
+ public:
+  explicit PushMessagingEventRouter(Profile* profile);
+  virtual ~PushMessagingEventRouter();
+
+  void Init();
+
+ private:
+  FRIEND_TEST_ALL_PREFIXES(PushMessagingApiTest, EventDispatch);
+
+  // InvalidationHandlerObserver implementation.
+  virtual void OnMessage(const std::string& extension_id,
+                         int subchannel,
+                         const std::string& payload) OVERRIDE;
+
+  Profile* profile_;
+
+  DISALLOW_COPY_AND_ASSIGN(PushMessagingEventRouter);
+};
+
+}  // namespace extension
+
+#endif  // CHROME_BROWSER_EXTENSIONS_API_PUSH_MESSAGING_PUSH_MESSAGING_API_H__