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

ash/system/chromeos/power/video_activity_notifier.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_VIDEO_ACTIVITY_NOTIFIER_H_
-#define ASH_SYSTEM_CHROMEOS_POWER_VIDEO_ACTIVITY_NOTIFIER_H_
-
-#include "ash/ash_export.h"
-#include "ash/wm/video_detector.h"
-#include "base/compiler_specific.h"
-#include "base/macros.h"
-#include "base/time/time.h"
-
-namespace ash {
-
-// Notifies the power manager when a video is playing.
-class ASH_EXPORT VideoActivityNotifier : public VideoDetector::Observer,
-                                         public ShellObserver {
- public:
-  explicit VideoActivityNotifier(VideoDetector* detector);
-  ~VideoActivityNotifier() override;
-
-  // VideoDetector::Observer implementation.
-  void OnVideoStateChanged(VideoDetector::State state) override;
-
-  // ShellObserver implementation.
-  void OnLockStateChanged(bool locked) override;
-
-  // If |notify_timer_| is running, calls MaybeNotifyPowerManager() and returns
-  // true. Returns false otherwise.
-  bool TriggerTimeoutForTest() WARN_UNUSED_RESULT;
-
- private:
-  bool should_notify_power_manager() {
-    return video_state_ != VideoDetector::State::NOT_PLAYING &&
-           !screen_is_locked_;
-  }
-
-  // Starts or stops |notify_timer_| as needed.
-  void UpdateTimer();
-
-  // Notifies powerd about video activity if should_notify_power_manager() is
-  // true.
-  void MaybeNotifyPowerManager();
-
-  VideoDetector* detector_;  // not owned
-
-  // Most-recently-observed video state.
-  VideoDetector::State video_state_;
-
-  // True if the screen is currently locked.
-  bool screen_is_locked_;
-
-  // Periodically calls MaybeNotifyPowerManager() while
-  // should_notify_power_manager() is true.
-  base::RepeatingTimer notify_timer_;
-
-  DISALLOW_COPY_AND_ASSIGN(VideoActivityNotifier);
-};
-
-}  // namespace ash
-
-#endif  // ASH_SYSTEM_CHROMEOS_POWER_VIDEO_ACTIVITY_NOTIFIER_H_