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

ash/system/tray/system_tray_notifier.cc

 // 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.
 
 #include "ash/system/tray/system_tray_notifier.h"
 
 namespace ash {
 
 SystemTrayNotifier::SystemTrayNotifier() {
 }
@@ skipping 210 matching lines @@
 void SystemTrayNotifier::NotifyRefreshClock() {
   FOR_EACH_OBSERVER(ClockObserver, clock_observers_, Refresh());
 }
 
 void SystemTrayNotifier::NotifyDateFormatChanged() {
   FOR_EACH_OBSERVER(ClockObserver,
                     clock_observers_,
                     OnDateFormatChanged());
 }
 
+void SystemTrayNotifier::NotifySystemClockTimeUpdated() {
+  FOR_EACH_OBSERVER(ClockObserver,
+                    clock_observers_,
+                    OnSystemClockTimeUpdated());
+}
+
 void SystemTrayNotifier::NotifyRefreshDrive(DriveOperationStatusList& list) {
   FOR_EACH_OBSERVER(DriveObserver,
                     drive_observers_,
                     OnDriveRefresh(list));
 }
 
 void SystemTrayNotifier::NotifyRefreshIME(bool show_message) {
   FOR_EACH_OBSERVER(IMEObserver,
                     ime_observers_,
                     OnIMERefresh(show_message));
@@ skipping 101 matching lines @@
 }
 
 void SystemTrayNotifier::NotifyEnterpriseDomainChanged() {
   FOR_EACH_OBSERVER(EnterpriseDomainObserver, enterprise_domain_observers_,
       OnEnterpriseDomainChanged());
 }
 
 #endif  // OS_CHROMEOS
 
 }  // namespace ash