chromeos: More power-related cleanup.

ash/system/chromeos/power/suspend_observer.cc

-// Copyright 2013 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/chromeos/power/suspend_observer.h"
-
-#include "ash/session_state_delegate.h"
-#include "ash/shell.h"
-#include "ash/wm/user_activity_detector.h"
-#include "base/prefs/pref_service.h"
-#include "chromeos/dbus/dbus_thread_manager.h"
-#include "chromeos/display/output_configurator.h"
-
-namespace ash {
-namespace internal {
-
-SuspendObserver::SuspendObserver()
-    : power_client_(
-          chromeos::DBusThreadManager::Get()->GetPowerManagerClient()),
-      session_client_(
-          chromeos::DBusThreadManager::Get()->GetSessionManagerClient()),
-      screen_locked_(false) {
-  power_client_->AddObserver(this);
-  session_client_->AddObserver(this);
-}
-
-SuspendObserver::~SuspendObserver() {
-  session_client_->RemoveObserver(this);
-  session_client_ = NULL;
-  power_client_->RemoveObserver(this);
-  power_client_ = NULL;
-}
-
-void SuspendObserver::SuspendImminent() {
-  Shell* shell = Shell::GetInstance();
-  SessionStateDelegate* delegate = shell->session_state_delegate();
-
-  // If the lock-before-suspending pref is set, get a callback to block
-  // suspend and ask the session manager to lock the screen.
-  if (!screen_locked_ && delegate->ShouldLockScreenBeforeSuspending() &&
-      delegate->CanLockScreen()) {
-    screen_lock_callback_ = power_client_->GetSuspendReadinessCallback();
-    VLOG(1) << "Requesting screen lock from SuspendObserver";
-    session_client_->RequestLockScreen();
-  }
-
-  shell->user_activity_detector()->OnDisplayPowerChanging();
-  shell->output_configurator()->SuspendDisplays();
-}
-
-void SuspendObserver::ScreenIsLocked() {
-  screen_locked_ = true;
-
-  // Stop blocking suspend after the screen is locked.
-  if (!screen_lock_callback_.is_null()) {
-    VLOG(1) << "Screen locked due to suspend";
-    // Run the callback asynchronously.  ScreenIsLocked() is currently
-    // called asynchronously after RequestLockScreen(), but this guards
-    // against it being made synchronous later.
-    base::MessageLoop::current()->PostTask(FROM_HERE, screen_lock_callback_);
-    screen_lock_callback_.Reset();
-  } else {
-    VLOG(1) << "Screen locked without suspend";
-  }
-}
-
-void SuspendObserver::ScreenIsUnlocked() {
-  screen_locked_ = false;
-}
-
-}  // namespace internal
-}  // namespace ash