ash: Refresh the tray items, instead of recreating them, when login status changes.

ash/system/ime/tray_ime.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_IME_TRAY_IME_H_
 #define ASH_SYSTEM_IME_TRAY_IME_H_
 #pragma once
 
 #include "ash/system/ime/ime_observer.h"
 #include "ash/system/tray/system_tray_item.h"
@@ skipping 25 matching lines @@
  private:
   void UpdateTrayLabel(const IMEInfo& info, size_t count);
 
   // Overridden from SystemTrayItem.
   virtual views::View* CreateTrayView(user::LoginStatus status) OVERRIDE;
   virtual views::View* CreateDefaultView(user::LoginStatus status) OVERRIDE;
   virtual views::View* CreateDetailedView(user::LoginStatus status) OVERRIDE;
   virtual void DestroyTrayView() OVERRIDE;
   virtual void DestroyDefaultView() OVERRIDE;
   virtual void DestroyDetailedView() OVERRIDE;
+  virtual void UpdateAfterLoginStatusChange(user::LoginStatus status) OVERRIDE;
 
   // Overridden from IMEObserver.
   virtual void OnIMERefresh() OVERRIDE;
 
   scoped_ptr<TrayItemView> tray_label_;
   scoped_ptr<tray::IMEDefaultView> default_;
   scoped_ptr<tray::IMEDetailedView> detailed_;
 
   DISALLOW_COPY_AND_ASSIGN(TrayIME);
 };
 
 }  // namespace internal
 }  // namespace ash
 
 #endif  // ASH_SYSTEM_IME_TRAY_IME_H_