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diff --git a/chromium/ash/wm/system_gesture_event_filter.h b/chromium/ash/wm/system_gesture_event_filter.h
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index 00000000000..a2a5c738db7
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+++ b/chromium/ash/wm/system_gesture_event_filter.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_WM_SYSTEM_GESTURE_EVENT_FILTER_H_
+#define ASH_WM_SYSTEM_GESTURE_EVENT_FILTER_H_
+
+#include "ash/shell.h"
+#include "ash/touch/touch_uma.h"
+#include "base/timer/timer.h"
+#include "ui/aura/window_observer.h"
+#include "ui/base/animation/animation_delegate.h"
+#include "ui/base/animation/linear_animation.h"
+#include "ui/base/events/event_handler.h"
+#include "ui/gfx/point.h"
+
+#include <map>
+
+namespace aura {
+class Window;
+}
+
+namespace ui {
+class LocatedEvent;
+}
+
+namespace ash {
+
+namespace test {
+class SystemGestureEventFilterTest;
+}
+
+namespace internal {
+class LongPressAffordanceHandler;
+class SystemPinchHandler;
+class TouchUMA;
+class TwoFingerDragHandler;
+
+// An event filter which handles system level gesture events.
+class SystemGestureEventFilter : public ui::EventHandler,
+                                 public aura::WindowObserver {
+ public:
+  SystemGestureEventFilter();
+  virtual ~SystemGestureEventFilter();
+
+  // Overridden from ui::EventHandler:
+  virtual void OnMouseEvent(ui::MouseEvent* event) OVERRIDE;
+  virtual void OnTouchEvent(ui::TouchEvent* event) OVERRIDE;
+  virtual void OnGestureEvent(ui::GestureEvent* event) OVERRIDE;
+
+  // Overridden from aura::WindowObserver.
+  virtual void OnWindowVisibilityChanged(aura::Window* window,
+                                         bool visible) OVERRIDE;
+  virtual void OnWindowDestroying(aura::Window* window) OVERRIDE;
+
+ private:
+  friend class ash::test::SystemGestureEventFilterTest;
+
+  // Removes system-gesture handlers for a window.
+  void ClearGestureHandlerForWindow(aura::Window* window);
+
+  typedef std::map<aura::Window*, SystemPinchHandler*> WindowPinchHandlerMap;
+  // Created on demand when a system-level pinch gesture is initiated. Destroyed
+  // when the system-level pinch gesture ends for the window.
+  WindowPinchHandlerMap pinch_handlers_;
+
+  bool system_gestures_enabled_;
+
+  scoped_ptr<LongPressAffordanceHandler> long_press_affordance_;
+  scoped_ptr<TwoFingerDragHandler> two_finger_drag_;
+
+  DISALLOW_COPY_AND_ASSIGN(SystemGestureEventFilter);
+};
+
+}  // namespace internal
+}  // namespace ash
+
+#endif  // ASH_WM_SYSTEM_GESTURE_EVENT_FILTER_H_