chromeos: Request screen lock directly from session manager.

chrome/browser/chromeos/power/power_button_observer.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 "chrome/browser/chromeos/power/power_button_observer.h"
 
 #include "ash/shell.h"
 #include "ash/system/user/login_status.h"
 #include "ash/wm/power_button_controller.h"
 #include "base/logging.h"
@@ skipping 33 matching lines @@
   registrar_.Add(
       this,
       content::NOTIFICATION_APP_TERMINATING,
       content::NotificationService::AllSources());
   registrar_.Add(
       this,
       chrome::NOTIFICATION_SCREEN_LOCK_STATE_CHANGED,
       content::NotificationService::AllSources());
 
   DBusThreadManager::Get()->GetPowerManagerClient()->AddObserver(this);
+  DBusThreadManager::Get()->GetSessionManagerClient()->AddObserver(this);
 
   // Tell the controller about the initial state.
   ash::Shell::GetInstance()->OnLoginStateChanged(GetCurrentLoginStatus());
 
   const ScreenLocker* locker = ScreenLocker::default_screen_locker();
   bool locked = locker && locker->locked();
   ash::Shell::GetInstance()->OnLockStateChanged(locked);
 }
 
 PowerButtonObserver::~PowerButtonObserver() {
+  DBusThreadManager::Get()->GetSessionManagerClient()->RemoveObserver(this);
   DBusThreadManager::Get()->GetPowerManagerClient()->RemoveObserver(this);
 }
 
 void PowerButtonObserver::Observe(int type,
                                   const content::NotificationSource& source,
                                   const content::NotificationDetails& details) {
   switch (type) {
     case chrome::NOTIFICATION_LOGIN_USER_CHANGED: {
       ash::Shell::GetInstance()->OnLoginStateChanged(GetCurrentLoginStatus());
       break;
@@ skipping 21 matching lines @@
     bool down, const base::TimeTicks& timestamp) {
   ash::Shell::GetInstance()->power_button_controller()->
       OnLockButtonEvent(down, timestamp);
 }
 
 void PowerButtonObserver::LockScreen() {
   ash::Shell::GetInstance()->power_button_controller()->OnStartingLock();
 }
 
 }  // namespace chromeos