mash: Move ash/common/wm/shelf to ash/common/shelf

ash/shelf/shelf_constants.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_SHELF_SHELF_CONSTANTS_H_
-#define ASH_SHELF_SHELF_CONSTANTS_H_
-
-#include "ash/ash_export.h"
-
-namespace ash {
-
-// Invalid image resource id used for ShelfItemDetails.
-extern const int kInvalidImageResourceID;
-
-const int kInvalidShelfID = 0;
-
-// Size of the shelf when visible (height when the shelf is horizontal).
-ASH_EXPORT extern const int kShelfSize;
-
-// Size of the space between buttons on the shelf.
-ASH_EXPORT extern const int kShelfButtonSpacing;
-
-// Size allocated for each button on the shelf.
-ASH_EXPORT extern const int kShelfButtonSize;
-
-// The direction of the focus cycling.
-enum CycleDirection {
-  CYCLE_FORWARD,
-  CYCLE_BACKWARD
-};
-
-}  // namespace ash
-
-#endif  // ASH_SHELF_SHELF_CONSTANTS_H_