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diff --git a/chromium/ui/wm/core/user_activity_detector.h b/chromium/ui/wm/core/user_activity_detector.h
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+++ b/chromium/ui/wm/core/user_activity_detector.h
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+// Copyright 2014 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_WM_CORE_USER_ACTIVITY_DETECTOR_H_
+#define UI_WM_CORE_USER_ACTIVITY_DETECTOR_H_
+
+#include "base/basictypes.h"
+#include "base/compiler_specific.h"
+#include "base/observer_list.h"
+#include "base/time/time.h"
+#include "ui/events/event_handler.h"
+#include "ui/wm/wm_export.h"
+
+namespace wm {
+
+class UserActivityObserver;
+
+// Watches for input events and notifies observers that the user is active.
+class WM_EXPORT UserActivityDetector : public ui::EventHandler {
+ public:
+  // Minimum amount of time between notifications to observers.
+  static const int kNotifyIntervalMs;
+
+  // Amount of time that mouse events should be ignored after notification
+  // is received that displays' power states are being changed.
+  static const int kDisplayPowerChangeIgnoreMouseMs;
+
+  UserActivityDetector();
+  virtual ~UserActivityDetector();
+
+  base::TimeTicks last_activity_time() const { return last_activity_time_; }
+
+  void set_now_for_test(base::TimeTicks now) { now_for_test_ = now; }
+
+  bool HasObserver(UserActivityObserver* observer) const;
+  void AddObserver(UserActivityObserver* observer);
+  void RemoveObserver(UserActivityObserver* observer);
+
+  // Called when displays are about to be turned on or off.
+  void OnDisplayPowerChanging();
+
+  // ui::EventHandler implementation.
+  virtual void OnKeyEvent(ui::KeyEvent* event) OVERRIDE;
+  virtual void OnMouseEvent(ui::MouseEvent* event) OVERRIDE;
+  virtual void OnScrollEvent(ui::ScrollEvent* event) OVERRIDE;
+  virtual void OnTouchEvent(ui::TouchEvent* event) OVERRIDE;
+  virtual void OnGestureEvent(ui::GestureEvent* event) OVERRIDE;
+
+ private:
+  // Returns |now_for_test_| if set or base::TimeTicks::Now() otherwise.
+  base::TimeTicks GetCurrentTime() const;
+
+  // Updates |last_activity_time_|.  Additionally notifies observers and
+  // updates |last_observer_notification_time_| if enough time has passed
+  // since the last notification.
+  void HandleActivity(const ui::Event* event);
+
+  ObserverList<UserActivityObserver> observers_;
+
+  // Last time at which user activity was observed.
+  base::TimeTicks last_activity_time_;
+
+  // Last time at which we notified observers that the user was active.
+  base::TimeTicks last_observer_notification_time_;
+
+  // If set, used when the current time is needed.  This can be set by tests to
+  // simulate the passage of time.
+  base::TimeTicks now_for_test_;
+
+  // If set, mouse events will be ignored until this time is reached. This
+  // is to avoid reporting mouse events that occur when displays are turned
+  // on or off as user activity.
+  base::TimeTicks honor_mouse_events_time_;
+
+  DISALLOW_COPY_AND_ASSIGN(UserActivityDetector);
+};
+
+}  // namespace wm
+
+#endif  // UI_WM_CORE_USER_ACTIVITY_DETECTOR_H_