Add countdown when session time is limited

ash/system/tray/system_tray.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.h"
 
 #include "ash/ash_switches.h"
 #include "ash/shell.h"
 #include "ash/shell/panel_window.h"
 #include "ash/shell_window_ids.h"
 #include "ash/system/audio/tray_volume.h"
 #include "ash/system/bluetooth/tray_bluetooth.h"
 #include "ash/system/brightness/tray_brightness.h"
 #include "ash/system/chromeos/tray_display.h"
 #include "ash/system/date/tray_date.h"
 #include "ash/system/drive/tray_drive.h"
 #include "ash/system/ime/tray_ime.h"
 #include "ash/system/locale/tray_locale.h"
 #include "ash/system/logout_button/tray_logout_button.h"
 #include "ash/system/monitor/tray_monitor.h"
 #include "ash/system/power/power_supply_status.h"
 #include "ash/system/power/tray_power.h"
+#include "ash/system/session_length_limit/tray_session_length_limit.h"
 #include "ash/system/settings/tray_settings.h"
 #include "ash/system/status_area_widget.h"
 #include "ash/system/tray/system_tray_delegate.h"
 #include "ash/system/tray/system_tray_item.h"
 #include "ash/system/tray/tray_bubble_wrapper.h"
 #include "ash/system/tray/tray_constants.h"
 #include "ash/system/tray_accessibility.h"
 #include "ash/system/tray_caps_lock.h"
 #include "ash/system/tray_update.h"
 #include "ash/system/user/login_status.h"
@@ skipping 88 matching lines @@
     (*it)->DestroyTrayView();
   }
 }
 
 void SystemTray::InitializeTrayItems(SystemTrayDelegate* delegate) {
   internal::TrayBackgroundView::Initialize();
   CreateItems(delegate);
 }
 
 void SystemTray::CreateItems(SystemTrayDelegate* delegate) {
+  AddTrayItem(new internal::TraySessionLengthLimit(this));
   AddTrayItem(new internal::TrayLogoutButton(this));
   AddTrayItem(new internal::TrayUser(this));
   AddTrayItem(new internal::TrayIME(this));
   AddTrayItem(new internal::TrayAccessibility(this));
   AddTrayItem(new internal::TrayPower(this));
 #if defined(OS_CHROMEOS)
   AddTrayItem(new internal::TrayNetwork(this));
   AddTrayItem(new internal::TrayVPN(this));
   AddTrayItem(new internal::TraySms(this));
 #endif
@@ skipping 398 matching lines @@
         ConvertPointToWidget(this, &point);
         arrow_offset = point.x();
       }
     }
     ShowDefaultViewWithOffset(BUBBLE_CREATE_NEW, arrow_offset);
   }
   return true;
 }
 
 }  // namespace ash