Add countdown when session time is limited

ash/system/tray/system_tray_notifier.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 ASH_SYSTEM_TRAY_SYSTEM_TRAY_NOTIFIER_H_
 #define ASH_SYSTEM_TRAY_SYSTEM_TRAY_NOTIFIER_H_
 
 #include <string>
 #include <vector>
 
 #include "ash/ash_export.h"
 #include "ash/system/audio/audio_observer.h"
 #include "ash/system/bluetooth/bluetooth_observer.h"
 #include "ash/system/brightness/brightness_observer.h"
 #include "ash/system/chromeos/network/network_observer.h"
 #include "ash/system/chromeos/network/sms_observer.h"
 #include "ash/system/date/clock_observer.h"
 #include "ash/system/drive/drive_observer.h"
 #include "ash/system/ime/ime_observer.h"
 #include "ash/system/locale/locale_observer.h"
 #include "ash/system/logout_button/logout_button_observer.h"
 #include "ash/system/power/power_status_observer.h"
+#include "ash/system/session_length_limit/session_length_limit_observer.h"
 #include "ash/system/tray_accessibility.h"
 #include "ash/system/tray_caps_lock.h"
 #include "ash/system/user/update_observer.h"
 #include "ash/system/user/user_observer.h"
 #include "base/observer_list.h"
+#include "base/time.h"
 
 #if defined(OS_CHROMEOS)
 #include "ash/system/chromeos/network/network_observer.h"
 #include "ash/system/chromeos/network/sms_observer.h"
 #endif
 
 namespace ash {
 
 class ASH_EXPORT SystemTrayNotifier {
 public:
@@ skipping 26 matching lines @@
 
   void AddLocaleObserver(LocaleObserver* observer);
   void RemoveLocaleObserver(LocaleObserver* observer);
 
   void AddLogoutButtonObserver(LogoutButtonObserver* observer);
   void RemoveLogoutButtonObserver(LogoutButtonObserver* observer);
 
   void AddPowerStatusObserver(PowerStatusObserver* observer);
   void RemovePowerStatusObserver(PowerStatusObserver* observer);
 
+  void AddSessionLengthLimitObserver(SessionLengthLimitObserver* observer);
+  void RemoveSessionLengthLimitObserver(SessionLengthLimitObserver* observer);
+
   void AddUpdateObserver(UpdateObserver* observer);
   void RemoveUpdateObserver(UpdateObserver* observer);
 
   void AddUserObserver(UserObserver* observer);
   void RemoveUserObserver(UserObserver* observer);
 
 #if defined(OS_CHROMEOS)
   void AddNetworkObserver(NetworkObserver* observer);
   void RemoveNetworkObserver(NetworkObserver* observer);
 
@@ skipping 15 matching lines @@
   void NotifyRefreshClock();
   void NotifyDateFormatChanged();
   void NotifyRefreshDrive(DriveOperationStatusList& list);
   void NotifyRefreshIME(bool show_message);
   void NotifyShowLoginButtonChanged(bool show_login_button);
   void NotifyLocaleChanged(LocaleObserver::Delegate* delegate,
                            const std::string& cur_locale,
                            const std::string& from_locale,
                            const std::string& to_locale);
   void NotifyPowerStatusChanged(const PowerSupplyStatus& power_status);
+  void NotifySessionLengthUnlimited();
+  void NotifyRemainingSessionTimeChanged(const base::TimeDelta& remaining);
   void NotifyUpdateRecommended(UpdateObserver::UpdateSeverity severity);
   void NotifyUserUpdate();
 #if defined(OS_CHROMEOS)
   void NotifyRefreshNetwork(const NetworkIconInfo &info);
   void NotifySetNetworkMessage(NetworkTrayDelegate* delegate,
                                NetworkObserver::MessageType message_type,
                                NetworkObserver::NetworkType network_type,
                                const string16& title,
                                const string16& message,
                                const std::vector<string16>& links);
   void NotifyClearNetworkMessage(NetworkObserver::MessageType message_type);
   void NotifyVpnRefreshNetwork(const NetworkIconInfo &info);
   void NotifyWillToggleWifi();
   void NotifyAddSmsMessage(const base::DictionaryValue& message);
 #endif
 
  private:
   ObserverList<AccessibilityObserver> accessibility_observers_;
   ObserverList<AudioObserver> audio_observers_;
   ObserverList<BluetoothObserver> bluetooth_observers_;
   ObserverList<BrightnessObserver> brightness_observers_;
   ObserverList<CapsLockObserver> caps_lock_observers_;
   ObserverList<ClockObserver> clock_observers_;
   ObserverList<DriveObserver> drive_observers_;
   ObserverList<IMEObserver> ime_observers_;
   ObserverList<LocaleObserver> locale_observers_;
   ObserverList<LogoutButtonObserver> logout_button_observers_;
   ObserverList<PowerStatusObserver> power_status_observers_;
+  ObserverList<SessionLengthLimitObserver> session_length_limit_observers_;
   ObserverList<UpdateObserver> update_observers_;
   ObserverList<UserObserver> user_observers_;
 #if defined(OS_CHROMEOS)
   ObserverList<NetworkObserver> network_observers_;
   ObserverList<NetworkObserver> vpn_observers_;
   ObserverList<SmsObserver> sms_observers_;
 #endif
 
   DISALLOW_COPY_AND_ASSIGN(SystemTrayNotifier);
 };
 
 }  // namespace ash
 
 #endif  // ASH_SYSTEM_TRAY_SYSTEM_TRAY_NOTIFIER_H_