ash: Add accelerator for snapping windows left/right.

ash/wm/window_util.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_WM_WINDOW_UTIL_H_
 #define ASH_WM_WINDOW_UTIL_H_
 #pragma once
 
 #include "ash/ash_export.h"
 
@@ skipping 32 matching lines @@
 
 // Maximizes |window|, which must not be NULL.
 ASH_EXPORT void MaximizeWindow(aura::Window* window);
 
 // Minimizes |window|, which must not be NULL.
 ASH_EXPORT void MinimizeWindow(aura::Window* window);
 
 // Restores |window|, which must not be NULL.
 ASH_EXPORT void RestoreWindow(aura::Window* window);
 
+// Moves the window to the center of the monitor.
+ASH_EXPORT void CenterWindow(aura::Window* window);
+
 }  // namespace wm
 }  // namespace ash
 
 #endif  // ASH_WM_WINDOW_UTIL_H_