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

ash/common/shelf/shelf_types.h

 // Copyright (c) 2012 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_TYPES_H_
-#define ASH_SHELF_SHELF_TYPES_H_
+#ifndef ASH_COMMON_SHELF_SHELF_TYPES_H_
+#define ASH_COMMON_SHELF_SHELF_TYPES_H_
 
 // TODO(sky): make callers explicitly include this.
 #include "ash/common/wm/shelf/wm_shelf_types.h"
 
 namespace ash {
 
 enum ShelfAutoHideBehavior {
   // Always auto-hide.
   SHELF_AUTO_HIDE_BEHAVIOR_ALWAYS,
 
   // Never auto-hide.
   SHELF_AUTO_HIDE_BEHAVIOR_NEVER,
 
   // Always hide.
   SHELF_AUTO_HIDE_ALWAYS_HIDDEN,
 };
 
 enum ShelfAutoHideState {
   SHELF_AUTO_HIDE_SHOWN,
   SHELF_AUTO_HIDE_HIDDEN,
 };
 
+enum ShelfVisibilityState {
+  // Always visible.
+  SHELF_VISIBLE,
+
+  // A couple of pixels are reserved at the bottom for the shelf.
+  SHELF_AUTO_HIDE,
+
+  // Nothing is shown. Used for fullscreen windows.
+  SHELF_HIDDEN,
+};
+
 }  // namespace ash
 
-#endif  // ASH_SHELF_SHELF_TYPES_H_
+#endif  // ASH_COMMON_SHELF_SHELF_TYPES_H_