mash: Migrate ShelfLayoutManager ScreenUtil usage to ash common types.

ash/common/wm/wm_screen_util.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_SCREEN_UTIL_H_
 #define ASH_COMMON_WM_WM_SCREEN_UTIL_H_
 
 #include "ash/ash_export.h"
 
 namespace gfx {
 class Rect;
 }
 
 namespace ash {
 
 class WmWindow;
 
 namespace wm {
 
 ASH_EXPORT gfx::Rect GetDisplayWorkAreaBoundsInParent(WmWindow* window);
 ASH_EXPORT gfx::Rect GetDisplayWorkAreaBounds(WmWindow* window);
 ASH_EXPORT gfx::Rect GetDisplayBoundsInParent(WmWindow* window);
 ASH_EXPORT gfx::Rect GetMaximizedWindowBoundsInParent(WmWindow* window);
 
+// Returns the bounds of the physical display containing the shelf for |window|.
+// Physical displays can differ from logical displays in unified desktop mode.
+// TODO(oshima): Consider using physical displays in window layout, instead of
+// root windows, and only use logical display in display management code.
+ASH_EXPORT gfx::Rect GetDisplayBoundsWithShelf(WmWindow* window);
+
 }  // namespace wm
 }  // namespace ash
 
 #endif  // ASH_COMMON_WM_WM_SCREEN_UTIL_H_