Implemented screen rotation animation experiment.

ash/rotator/screen_rotation.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_SCREEN_ROTATION_H_
-#define ASH_SCREEN_ROTATION_H_
-
-#include "ash/ash_export.h"
-#include "base/basictypes.h"
-#include "base/memory/scoped_ptr.h"
-#include "ui/compositor/layer_animation_element.h"
-#include "ui/gfx/geometry/point.h"
-
-namespace ui {
-class InterpolatedTransform;
-class Layer;
-}
-
-namespace aura {
-class RootWindow;
-}
-
-namespace ash {
-
-// A screen rotation represents a single transition from one screen orientation
-// to another. The  intended usage is that a new instance of the class is
-// created for every transition. It is possible to update the target orientation
-// in the middle of a transition.
-class ASH_EXPORT ScreenRotation : public ui::LayerAnimationElement {
- public:
-  // |degrees| are clockwise. |layer| is the target of the animation. Does not
-  // take ownership of |layer|.
-  ScreenRotation(int degrees, ui::Layer* layer);
-  ~ScreenRotation() override;
-
- private:
-  // Generates the intermediate transformation matrices used during the
-  // animation.
-  void InitTransform(ui::Layer* layer);
-
-  // Implementation of ui::LayerAnimationDelegate
-  void OnStart(ui::LayerAnimationDelegate* delegate) override;
-  bool OnProgress(double t, ui::LayerAnimationDelegate* delegate) override;
-  void OnGetTarget(TargetValue* target) const override;
-  void OnAbort(ui::LayerAnimationDelegate* delegate) override;
-
-  scoped_ptr<ui::InterpolatedTransform> interpolated_transform_;
-
-  // The number of degrees to rotate.
-  int degrees_;
-
-  // The target origin.
-  gfx::Point new_origin_;
-
-  DISALLOW_COPY_AND_ASSIGN(ScreenRotation);
-};
-
-}  // namespace ash
-
-#endif  // ASH_SCREEN_ROTATION_H_