Reland: mash: Convert TrayBackgroundView to wm common types

ash/system/chromeos/session/logout_button_tray.h

 // Copyright 2014 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_CHROMEOS_SESSION_LOGOUT_BUTTON_TRAY_H_
 #define ASH_SYSTEM_CHROMEOS_SESSION_LOGOUT_BUTTON_TRAY_H_
 
 #include "ash/ash_export.h"
+#include "ash/common/system/tray/tray_background_view.h"
 #include "ash/system/chromeos/session/logout_button_observer.h"
-#include "ash/system/tray/tray_background_view.h"
 #include "ash/system/user/login_status.h"
 #include "base/compiler_specific.h"
 #include "base/macros.h"
 #include "base/time/time.h"
 #include "ui/views/controls/button/button.h"
 
 namespace views {
 class LabelButton;
 }
 
@@ skipping 31 matching lines @@
   LoginStatus login_status_;
   bool show_logout_button_in_tray_;
   base::TimeDelta dialog_duration_;
 
   DISALLOW_COPY_AND_ASSIGN(LogoutButtonTray);
 };
 
 }  // namespace ash
 
 #endif  // ASH_SYSTEM_CHROMEOS_SESSION_LOGOUT_BUTTON_TRAY_H_