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diff --git a/chromium/ash/magnifier/magnification_controller.h b/chromium/ash/magnifier/magnification_controller.h
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+++ b/chromium/ash/magnifier/magnification_controller.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_MAGNIFIER_MAGNIFICATION_CONTROLLER_H_
+#define ASH_MAGNIFIER_MAGNIFICATION_CONTROLLER_H_
+
+#include "base/compiler_specific.h"
+#include "base/logging.h"
+#include "base/memory/scoped_ptr.h"
+#include "ui/gfx/point.h"
+#include "ui/gfx/rect.h"
+
+namespace aura {
+class RootWindow;
+}
+
+namespace ash {
+
+class MagnificationController {
+ public:
+  virtual ~MagnificationController() {}
+
+  // Creates a new MagnificationController. The caller takes ownership of the
+  // returned object.
+  static MagnificationController* CreateInstance();
+
+  // Enables (or disables if |enabled| is false) screen magnifier feature.
+  virtual void SetEnabled(bool enabled) = 0;
+
+  // Returns if the screen magnifier is enabled or not.
+  virtual bool IsEnabled() const = 0;
+
+  // Sets the magnification ratio. 1.0f means no magnification.
+  virtual void SetScale(float scale, bool animate) = 0;
+  // Returns the current magnification ratio.
+  virtual float GetScale() const = 0;
+
+  // Set the top-left point of the magnification window.
+  virtual void MoveWindow(int x, int y, bool animate) = 0;
+  virtual void MoveWindow(const gfx::Point& point, bool animate) = 0;
+  // Returns the current top-left point of the magnification window.
+  virtual gfx::Point GetWindowPosition() const = 0;
+
+  // Ensures that the given point/rect is inside the magnification window. If
+  // not, the controller moves the window to contain the given point/rect.
+  virtual void EnsureRectIsVisible(const gfx::Rect& rect, bool animate) = 0;
+  virtual void EnsurePointIsVisible(const gfx::Point& point, bool animate) = 0;
+
+  // Returns |point_of_interest_| in MagnificationControllerImpl. This is
+  // the internal variable to stores the last mouse cursor (or last touched)
+  // location. This method is only for test purpose.
+  virtual gfx::Point GetPointOfInterestForTesting() = 0;
+
+ protected:
+  MagnificationController() {}
+};
+
+}  // namespace ash
+
+#endif  // ASH_MAGNIFIER_MAGNIFICATION_CONTROLLER_H_