Hook up system clock update dbus signal to chrome and ash tray ui.

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>
 
@@ skipping 89 matching lines @@
   void NotifyAccessibilityModeChanged(
       AccessibilityNotificationVisibility notify);
   void NotifyVolumeChanged(float level);
   void NotifyMuteToggled();
   void NotifyRefreshBluetooth();
   void NotifyBluetoothDiscoveringChanged();
   void NotifyBrightnessChanged(double level, bool user_initialted);
   void NotifyCapsLockChanged(bool enabled, bool search_mapped_to_caps_lock);
   void NotifyRefreshClock();
   void NotifyDateFormatChanged();
+  void NotifySystemClockTimeUpdated();
   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 NotifySessionStartTimeChanged(const base::Time& session_start_time);
   void NotifySessionLengthLimitChanged(const base::TimeDelta& limit);
@@ skipping 35 matching lines @@
   ObserverList<SmsObserver> sms_observers_;
   ObserverList<EnterpriseDomainObserver> enterprise_domain_observers_;
 #endif
 
   DISALLOW_COPY_AND_ASSIGN(SystemTrayNotifier);
 };
 
 }  // namespace ash
 
 #endif  // ASH_SYSTEM_TRAY_SYSTEM_TRAY_NOTIFIER_H_