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diff --git a/chromium/ash/touch/touch_observer_hud.h b/chromium/ash/touch/touch_observer_hud.h
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+++ b/chromium/ash/touch/touch_observer_hud.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_TOUCH_TOUCH_OBSERVER_HUD_H_
+#define ASH_TOUCH_TOUCH_OBSERVER_HUD_H_
+
+#include "ash/ash_export.h"
+#include "ash/display/display_controller.h"
+#include "ui/events/event_handler.h"
+#include "ui/gfx/display_observer.h"
+#include "ui/views/widget/widget_observer.h"
+
+#if defined(OS_CHROMEOS)
+#include "chromeos/display/output_configurator.h"
+#endif  // defined(OS_CHROMEOS)
+
+namespace views {
+class Widget;
+}
+
+namespace ash {
+namespace internal {
+
+// An event filter which handles system level gesture events. Objects of this
+// class manage their own lifetime.
+class ASH_EXPORT TouchObserverHUD
+    : public ui::EventHandler,
+      public views::WidgetObserver,
+      public gfx::DisplayObserver,
+#if defined(OS_CHROMEOS)
+      public chromeos::OutputConfigurator::Observer,
+#endif  // defined(OS_CHROMEOS)
+      public DisplayController::Observer {
+ public:
+  // Called to clear touch points and traces from the screen. Default
+  // implementation does nothing. Sub-classes should implement appropriately.
+  virtual void Clear();
+
+  // Removes the HUD from the screen.
+  void Remove();
+
+  int64 display_id() const { return display_id_; }
+
+ protected:
+  explicit TouchObserverHUD(aura::Window* initial_root);
+
+  virtual ~TouchObserverHUD();
+
+  virtual void SetHudForRootWindowController(
+      RootWindowController* controller) = 0;
+  virtual void UnsetHudForRootWindowController(
+      RootWindowController* controller) = 0;
+
+  views::Widget* widget() { return widget_; }
+
+  // Overriden from ui::EventHandler.
+  virtual void OnTouchEvent(ui::TouchEvent* event) OVERRIDE;
+
+  // Overridden from views::WidgetObserver.
+  virtual void OnWidgetDestroying(views::Widget* widget) OVERRIDE;
+
+  // Overridden from gfx::DisplayObserver.
+  virtual void OnDisplayBoundsChanged(const gfx::Display& display) OVERRIDE;
+  virtual void OnDisplayAdded(const gfx::Display& new_display) OVERRIDE;
+  virtual void OnDisplayRemoved(const gfx::Display& old_display) OVERRIDE;
+
+#if defined(OS_CHROMEOS)
+  // Overriden from chromeos::OutputConfigurator::Observer.
+  virtual void OnDisplayModeChanged(
+      const std::vector<chromeos::OutputConfigurator::OutputSnapshot>& outputs)
+      OVERRIDE;
+#endif  // defined(OS_CHROMEOS)
+
+  // Overriden form DisplayController::Observer.
+  virtual void OnDisplayConfigurationChanging() OVERRIDE;
+  virtual void OnDisplayConfigurationChanged() OVERRIDE;
+
+ private:
+  friend class TouchHudTestBase;
+
+  const int64 display_id_;
+  aura::Window* root_window_;
+
+  views::Widget* widget_;
+
+  DISALLOW_COPY_AND_ASSIGN(TouchObserverHUD);
+};
+
+}  // namespace internal
+}  // namespace ash
+
+#endif  // ASH_TOUCH_TOUCH_OBSERVER_HUD_H_