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

ash/common/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_
+#ifndef ASH_COMMON_SHELF_SHELF_CONSTANTS_H_
+#define ASH_COMMON_SHELF_SHELF_CONSTANTS_H_
 
 #include "ash/ash_export.h"
 
 namespace ash {
 
+// Max alpha of the shelf background.
+ASH_EXPORT extern const int kShelfBackgroundAlpha;
+
 // 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;
 
+// Animation duration for switching black shelf and dock background on and off.
+ASH_EXPORT extern const int kTimeToSwitchBackgroundMs;
+
 // The direction of the focus cycling.
-enum CycleDirection {
-  CYCLE_FORWARD,
-  CYCLE_BACKWARD
-};
+enum CycleDirection { CYCLE_FORWARD, CYCLE_BACKWARD };
 
 }  // namespace ash
 
-#endif  // ASH_SHELF_SHELF_CONSTANTS_H_
+#endif  // ASH_COMMON_SHELF_SHELF_CONSTANTS_H_