chromeos: Move files in //ash/common to //ash, part 2

ash/common/wm/wm_snap_to_pixel_layout_manager.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_SNAP_TO_PIXEL_LAYOUT_MANAGER_H_
-#define ASH_COMMON_WM_WM_SNAP_TO_PIXEL_LAYOUT_MANAGER_H_
-
-#include "ash/ash_export.h"
-#include "ash/common/wm_layout_manager.h"
-#include "base/macros.h"
-
-namespace ash {
-namespace wm {
-
-// A layout manager that places children's layer at the physical pixel
-// boundaries.
-class ASH_EXPORT WmSnapToPixelLayoutManager : public WmLayoutManager {
- public:
-  WmSnapToPixelLayoutManager();
-  ~WmSnapToPixelLayoutManager() override;
-
-  // Sets WmSnapToPixelLayoutManager as the LayoutManager on the appropriate
-  // descendants of |window|.
-  static void InstallOnContainers(WmWindow* window);
-
- protected:
-  // Overridden from aura::LayoutManager:
-  void OnWindowResized() override;
-  void OnWindowAddedToLayout(WmWindow* child) override;
-  void OnWillRemoveWindowFromLayout(WmWindow* child) override;
-  void OnWindowRemovedFromLayout(WmWindow* child) override;
-  void OnChildWindowVisibilityChanged(WmWindow* child, bool visibile) override;
-  void SetChildBounds(WmWindow* child,
-                      const gfx::Rect& requested_bounds) override;
-
- private:
-  DISALLOW_COPY_AND_ASSIGN(WmSnapToPixelLayoutManager);
-};
-
-}  // namespace wm
-}  // namespace ash
-
-#endif  // ASH_COMMON_WM_WM_SNAP_TO_PIXEL_LAYOUT_MANAGER_H_