chromeos: Move files in //ash/common to //ash, part 1

ash/system/chromeos/power/power_event_observer.h

-// 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.
-
-#ifndef ASH_SYSTEM_CHROMEOS_POWER_POWER_EVENT_OBSERVER_H_
-#define ASH_SYSTEM_CHROMEOS_POWER_POWER_EVENT_OBSERVER_H_
-
-#include "ash/ash_export.h"
-#include "base/callback.h"
-#include "base/compiler_specific.h"
-#include "base/macros.h"
-#include "chromeos/dbus/power_manager_client.h"
-#include "chromeos/dbus/session_manager_client.h"
-
-namespace ash {
-
-// A class that observes power-management-related events.
-class ASH_EXPORT PowerEventObserver
-    : public chromeos::PowerManagerClient::Observer,
-      public chromeos::SessionManagerClient::Observer {
- public:
-  // This class registers/unregisters itself as an observer in ctor/dtor.
-  PowerEventObserver();
-  ~PowerEventObserver() override;
-
-  // Called by the WebUIScreenLocker when all the lock screen animations have
-  // completed.  This really should be implemented via an observer but since
-  // ash/ isn't allowed to depend on chrome/ we need to have the
-  // WebUIScreenLocker reach into ash::Shell to make this call.
-  void OnLockAnimationsComplete();
-
-  // chromeos::PowerManagerClient::Observer overrides:
-  void BrightnessChanged(int level, bool user_initiated) override;
-  void SuspendImminent() override;
-  void SuspendDone(const base::TimeDelta& sleep_duration) override;
-
-  // chromeos::SessionManagerClient::Observer overrides.
-  void ScreenIsLocked() override;
-  void ScreenIsUnlocked() override;
-
-  // Is the screen currently locked?
-  bool screen_locked_;
-
-  // Have the lock screen animations completed?
-  bool waiting_for_lock_screen_animations_;
-
-  // If set, called when the lock screen animations have completed to confirm
-  // that the system is ready to be suspended.
-  base::Closure screen_lock_callback_;
-
- private:
-  DISALLOW_COPY_AND_ASSIGN(PowerEventObserver);
-};
-
-}  // namespace chromeos
-
-#endif  // ASH_SYSTEM_CHROMEOS_POWER_POWER_EVENT_OBSERVER_H_