Introduce a //content/ API for dispatching notificationclick events.

content/browser/notifications/notification_event_dispatcher_impl.h

+// Copyright 2014 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 CONTENT_BROWSER_NOTIFICATIONS_NOTIFICATION_EVENT_DISPATCHER_IMPL_H_
+#define CONTENT_BROWSER_NOTIFICATIONS_NOTIFICATION_EVENT_DISPATCHER_IMPL_H_
+
+#include "base/memory/singleton.h"
+#include "content/public/browser/notification_event_dispatcher.h"
+
+namespace content {
+
+class NotificationEventDispatcherImpl : public NotificationEventDispatcher {
+ public:
+  // Returns the instance of the NotificationEventDispatcherImpl. Must be called
+  // on the UI thread.
+  static NotificationEventDispatcherImpl* GetInstance();
+
+  // NotificationEventDispatcher implementation.
+  void DispatchNotificationClickEvent(
+      BrowserContext* browser_context,
+      const GURL& origin,
+      int64 service_worker_registration_id,
+      const std::string& notification_id,
+      const ShowDesktopNotificationHostMsgParams& notification_data,
+      const NotificationClickDispatchCompleteCallback& callback) override;
+
+ private:
+  NotificationEventDispatcherImpl();
+  ~NotificationEventDispatcherImpl() override;
+
+  friend struct DefaultSingletonTraits<NotificationEventDispatcherImpl>;
+
+  DISALLOW_COPY_AND_ASSIGN(NotificationEventDispatcherImpl);
+};
+
+}  // namespace content
+
+#endif  // CONTENT_BROWSER_NOTIFICATIONS_NOTIFICATION_EVENT_DISPATCHER_IMPL_H_