Reland r107720 - Enable the new layer animation framework.

ui/aura/screen_rotation.h

+// Copyright (c) 2011 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 UI_AURA_SCREEN_ROTATION_H_
+#define UI_AURA_SCREEN_ROTATION_H_
+#pragma once
+
+#include "base/basictypes.h"
+#include "base/memory/scoped_ptr.h"
+#include "ui/base/animation/animation_delegate.h"
+#include "ui/gfx/compositor/layer_animation_element.h"
+#include "ui/gfx/point.h"
+
+namespace ui {
+class InterpolatedTransform;
+class LayerAnimationDelegate;
+}
+
+// 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 ScreenRotation : public ui::LayerAnimationElement {
+ public:
+  // The screen rotation does not own the view or the listener, and these
+  // objects are required to outlive the Screen rotation object.
+  ScreenRotation(int degrees);
+  virtual ~ScreenRotation();
+
+ private:
+  // Implementation of ui::LayerAnimationDelegate
+  virtual void OnStart(ui::LayerAnimationDelegate* delegate) OVERRIDE;
+  virtual void OnProgress(double t,
+                          ui::LayerAnimationDelegate* delegate) OVERRIDE;
+  virtual void OnGetTarget(TargetValue* target) const OVERRIDE;
+  virtual void OnAbort() OVERRIDE;
+
+  static const ui::LayerAnimationElement::AnimatableProperties& GetProperties();
+
+  // Generates the intermediate transformation matrices used during the
+  // animation.
+  scoped_ptr<ui::InterpolatedTransform> interpolated_transform_;
+
+  // The number of degrees to rotate.
+  int degrees_;
+
+  // The target origin for |view_|
+  gfx::Point new_origin_;
+
+  DISALLOW_COPY_AND_ASSIGN(ScreenRotation);
+};
+
+#endif  // UI_AURA_SCREEN_ROTATION_H_