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diff --git a/chromium/ash/rotator/screen_rotation.h b/chromium/ash/rotator/screen_rotation.h
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+++ b/chromium/ash/rotator/screen_rotation.h
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+// 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/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);
+  virtual ~ScreenRotation();
+
+ private:
+  // Generates the intermediate transformation matrices used during the
+  // animation.
+  void InitTransform(ui::Layer* layer);
+
+  // Implementation of ui::LayerAnimationDelegate
+  virtual void OnStart(ui::LayerAnimationDelegate* delegate) OVERRIDE;
+  virtual bool OnProgress(double t,
+                          ui::LayerAnimationDelegate* delegate) OVERRIDE;
+  virtual void OnGetTarget(TargetValue* target) const OVERRIDE;
+  virtual void OnAbort(ui::LayerAnimationDelegate* delegate) OVERRIDE;
+
+  static const ui::LayerAnimationElement::AnimatableProperties&
+      GetProperties();
+
+  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_