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+// Copyright (c) 2010 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_CHROMEOS_BROWSER_NOTIFICATION_OBSERVERS_H_
+#define CHROME_BROWSER_CHROMEOS_BROWSER_NOTIFICATION_OBSERVERS_H_
+
+#include "base/atomic_sequence_num.h"
+#include "base/singleton.h"
+#include "chrome/common/notification_observer.h"
+#include "chrome/common/notification_registrar.h"
+#include "chrome/common/notification_source.h"
+#include "chrome/common/notification_type.h"
+
+// Global notification observers for chrome os.
+namespace chromeos {
+
+// Notification observer to log the initial time of when the first tab
+// page is rendered for Chrome OS.
+class InitialTabNotificationObserver : public NotificationObserver {
+ public:
+ InitialTabNotificationObserver();
+ virtual ~InitialTabNotificationObserver();
+
+ static InitialTabNotificationObserver* Get() {
+ return Singleton<InitialTabNotificationObserver>::get();
+ }
+
+ // NotificationObserver implementation.
+ virtual void Observe(NotificationType type,
+ const NotificationSource& source,
+ const NotificationDetails& details);
+
+ private:
+ NotificationRegistrar registrar_;
+ base::AtomicSequenceNumber num_tabs_;
+
+ DISALLOW_COPY_AND_ASSIGN(InitialTabNotificationObserver);
+};
+
+} // namespace chromeos
+
+#endif // CHROME_BROWSER_CHROMEOS_BROWSER_NOTIFICATION_OBSERVERS_H_