mash: Port ash_sysui ShelfDelegateMus impl to mojo:ash.

ash/mus/shelf_layout_manager.h

-// Copyright 2015 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_MUS_SHELF_LAYOUT_MANAGER_H_
-#define ASH_MUS_SHELF_LAYOUT_MANAGER_H_
-
-#include "ash/mus/layout_manager.h"
-#include "base/macros.h"
-#include "mash/shelf/public/interfaces/shelf_constants.mojom.h"
-
-namespace ash {
-namespace mus {
-
-class ShelfLayoutManagerDelegate;
-
-// Lays out the shelf within shelf containers.
-class ShelfLayoutManager : public LayoutManager {
- public:
-  ShelfLayoutManager(ui::Window* owner, ShelfLayoutManagerDelegate* delegate);
-  ~ShelfLayoutManager() override;
-
-  // Returns the shelf, which may be null.
-  ui::Window* GetShelfWindow();
-
-  void SetAlignment(mash::shelf::mojom::Alignment alignment);
-  void SetAutoHideBehavior(mash::shelf::mojom::AutoHideBehavior auto_hide);
-
-  mash::shelf::mojom::Alignment alignment() const { return alignment_; }
-  mash::shelf::mojom::AutoHideBehavior auto_hide_behavior() const {
-    return auto_hide_behavior_;
-  }
-
- private:
-  // Overridden from LayoutManager:
-  void LayoutWindow(ui::Window* window) override;
-  void WindowAdded(ui::Window* window) override;
-
-  ShelfLayoutManagerDelegate* delegate_;
-  mash::shelf::mojom::Alignment alignment_;
-  mash::shelf::mojom::AutoHideBehavior auto_hide_behavior_;
-
-  DISALLOW_COPY_AND_ASSIGN(ShelfLayoutManager);
-};
-
-}  // namespace mus
-}  // namespace ash
-
-#endif  // ASH_MUS_SHELF_LAYOUT_MANAGER_H_