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

ash/common/system/chromeos/power/dual_role_notification.h

-// Copyright 2015 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_COMMON_SYSTEM_CHROMEOS_POWER_DUAL_ROLE_NOTIFICATION_H_
-#define ASH_COMMON_SYSTEM_CHROMEOS_POWER_DUAL_ROLE_NOTIFICATION_H_
-
-#include <stddef.h>
-
-#include <memory>
-
-#include "ash/ash_export.h"
-#include "ash/common/system/chromeos/power/power_status.h"
-#include "base/macros.h"
-
-namespace message_center {
-class MessageCenter;
-class Notification;
-}
-
-namespace ash {
-
-// Shows a non-toasting MessageCenter notification based on what dual-role
-// devices are connected.
-class ASH_EXPORT DualRoleNotification {
- public:
-  explicit DualRoleNotification(message_center::MessageCenter* message_center);
-  ~DualRoleNotification();
-
-  // Creates or updates the notification.
-  void Update();
-
- private:
-  // Creates the notification using the updated status.
-  std::unique_ptr<message_center::Notification> CreateNotification();
-
-  message_center::MessageCenter* message_center_;
-  std::unique_ptr<PowerStatus::PowerSource> dual_role_source_;
-  std::unique_ptr<PowerStatus::PowerSource> dual_role_sink_;
-  size_t num_dual_role_sinks_;
-  bool line_power_connected_;
-
-  DISALLOW_COPY_AND_ASSIGN(DualRoleNotification);
-};
-
-}  // namespace ash
-
-#endif  // ASH_COMMON_SYSTEM_CHROMEOS_POWER_DUAL_ROLE_NOTIFICATION_H_