mash: Migrate shelf menus to wm common types

ash/common/wm/wm_user_metrics_action.h

 // Copyright 2016 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_WM_WM_USER_METRICS_ACTION_H_
 #define ASH_COMMON_WM_WM_USER_METRICS_ACTION_H_
 
 namespace ash {
 namespace wm {
 
 enum class WmUserMetricsAction {
   DRAG_MAXIMIZE_LEFT,
   DRAG_MAXIMIZE_RIGHT,
+  SHELF_ALIGNMENT_SET_BOTTOM,
+  SHELF_ALIGNMENT_SET_LEFT,
+  SHELF_ALIGNMENT_SET_RIGHT,
+
   // Thumbnail sized overview of windows triggered by pressing the overview key.
   WINDOW_OVERVIEW,
 
   // User selected a window in overview mode different from the
   // previously-active window.
   WINDOW_OVERVIEW_ACTIVE_WINDOW_CHANGED,
 
   // Selecting a window in overview mode by pressing the enter key.
   WINDOW_OVERVIEW_ENTER_KEY,
 };
 
 }  // namespace wm
 }  // namespace ash
 
 #endif  // ASH_COMMON_WM_WM_USER_METRICS_ACTION_H_