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

ash/system/rotation/tray_rotation_lock.h

-// Copyright 2014 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_ROTATION_TRAY_ROTATION_LOCK_H_
-#define ASH_SYSTEM_ROTATION_TRAY_ROTATION_LOCK_H_
-
-#include "ash/common/shell_observer.h"
-#include "ash/display/screen_orientation_controller_chromeos.h"
-#include "ash/system/tray/tray_image_item.h"
-#include "base/macros.h"
-
-namespace ash {
-
-// TrayRotationLock is a provider of views for the SystemTray. Both a tray view
-// and a default view are provided. Each view indicates the current state of
-// the rotation lock for the display which it appears on. The default view can
-// be interacted with, it toggles the state of the rotation lock.
-// TrayRotationLock is only available on the primary display.
-class ASH_EXPORT TrayRotationLock
-    : public TrayImageItem,
-      public ScreenOrientationController::Observer,
-      public ShellObserver {
- public:
-  explicit TrayRotationLock(SystemTray* system_tray);
-  ~TrayRotationLock() override;
-
-  // ScreenOrientationController::Observer:
-  void OnRotationLockChanged(bool rotation_locked) override;
-
-  // SystemTrayItem:
-  views::View* CreateDefaultView(LoginStatus status) override;
-
-  // ShellObserver:
-  void OnMaximizeModeStarted() override;
-  void OnMaximizeModeEnded() override;
-
-  // TrayImageItem:
-  void DestroyTrayView() override;
-
- protected:
-  // TrayImageItem:
-  bool GetInitialVisibility() override;
-
- private:
-  friend class TrayRotationLockTest;
-
-  // True if |on_primary_display_|, maximize mode is enabled, and rotation is
-  // locked.
-  bool ShouldBeVisible();
-
-  // True if this is owned by a SystemTray on the primary display.
-  bool OnPrimaryDisplay() const;
-
-  // Removes TrayRotationLock as a ScreenOrientationController::Observer if
-  // currently observing.
-  void StopObservingRotation();
-
-  DISALLOW_COPY_AND_ASSIGN(TrayRotationLock);
-};
-
-}  // namespace ash
-
-#endif  // ASH_SYSTEM_ROTATION_TRAY_ROTATION_LOCK_H_