Add login time metric for chromeos.

chrome/browser/chromeos/browser_notification_observers.h

 // 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 "base/time.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();
   }
 
+  void SetLoginSuccessTime() {
+    login_success_time_ = base::Time::NowFromSystemTime();
+  }
+
   // NotificationObserver implementation.
   virtual void Observe(NotificationType type,
                        const NotificationSource& source,
                        const NotificationDetails& details);
 
  private:
   NotificationRegistrar registrar_;
   base::AtomicSequenceNumber num_tabs_;
+  base::Time login_success_time_;
 
   DISALLOW_COPY_AND_ASSIGN(InitialTabNotificationObserver);
 };
 
 // Collects LOGIN_AUTHENTICATION notifications and logs uptime
 // when login was successful.
 class LogLoginSuccessObserver : public NotificationObserver {
  public:
    LogLoginSuccessObserver();
    virtual ~LogLoginSuccessObserver();
 
    static LogLoginSuccessObserver* Get() {
      return Singleton<LogLoginSuccessObserver>::get();
    }
 
   // NotificationObserver interface.
   virtual void Observe(NotificationType type, const NotificationSource& source,
                        const NotificationDetails& details);
 
  private:
   NotificationRegistrar registrar_;
 
   DISALLOW_COPY_AND_ASSIGN(LogLoginSuccessObserver);
 };
 
 }  // namespace chromeos
 
 #endif  // CHROME_BROWSER_CHROMEOS_BROWSER_NOTIFICATION_OBSERVERS_H_