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      1 // Copyright 2013 The Chromium Authors. All rights reserved.
      2 // Use of this source code is governed by a BSD-style license that can be
      3 // found in the LICENSE file.
      4 
      5 #include "ash/session/session_state_observer.h"
      6 
      7 #include "ash/session/session_state_delegate.h"
      8 #include "ash/shell.h"
      9 
     10 namespace ash {
     11 
     12 ScopedSessionStateObserver::ScopedSessionStateObserver(
     13     ash::SessionStateObserver* observer)
     14     : observer_(observer) {
     15   ash::Shell::GetInstance()->session_state_delegate()->AddSessionStateObserver(
     16       observer_);
     17 }
     18 
     19 ScopedSessionStateObserver::~ScopedSessionStateObserver() {
     20   ash::Shell::GetInstance()
     21       ->session_state_delegate()
     22       ->RemoveSessionStateObserver(observer_);
     23 }
     24 
     25 }  // namespace ash
     26