app_shell: Add support for mouse cursors.

ash/wm/image_cursors.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_IMAGE_CURSORS_H_
-#define ASH_WM_IMAGE_CURSORS_H_
-
-#include "ash/ash_export.h"
-#include "base/memory/scoped_ptr.h"
-#include "base/strings/string16.h"
-#include "ui/base/cursor/cursor.h"
-#include "ui/gfx/display.h"
-#include "ui/gfx/native_widget_types.h"
-
-namespace ui {
-class CursorLoader;
-}
-
-namespace ash {
-
-// A utility class that provides cursors for NativeCursors for which we have
-// image resources.
-class ASH_EXPORT ImageCursors {
- public:
-  ImageCursors();
-  ~ImageCursors();
-
-  // Returns the scale and rotation of the currently loaded cursor.
-  float GetScale() const;
-  gfx::Display::Rotation GetRotation() const;
-
-  // Sets the display the cursors are loaded for. The device scale factor
-  // determines the size of the image to load, and the rotation of the display
-  // determines if the image and its host point has to be retated.
-  // Returns true if the cursor image is reloaded.
-  bool SetDisplay(const gfx::Display& display);
-
-  // Sets the type of the mouse cursor icon.
-  void SetCursorSet(ui::CursorSetType cursor_set);
-
-  // Sets the platform cursor based on the native type of |cursor|.
-  void SetPlatformCursor(gfx::NativeCursor* cursor);
-
- private:
-  // Reloads the all loaded cursors in the cursor loader.
-  void ReloadCursors();
-
-  scoped_ptr<ui::CursorLoader> cursor_loader_;
-  ui::CursorSetType cursor_set_;
-
-  DISALLOW_COPY_AND_ASSIGN(ImageCursors);
-};
-
-}  // namespace ash
-
-#endif  // ASH_WM_IMAGE_CURSORS_H_