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diff --git a/chromium/ui/wm/core/user_activity_observer.h b/chromium/ui/wm/core/user_activity_observer.h
new file mode 100644
index 00000000000..0fb35a61f06
--- /dev/null
+++ b/chromium/ui/wm/core/user_activity_observer.h
@@ -0,0 +1,35 @@
+// 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_OBSERVER_H_
+#define UI_WM_CORE_USER_ACTIVITY_OBSERVER_H_
+
+#include "base/basictypes.h"
+#include "ui/wm/wm_export.h"
+
+namespace ui {
+class Event;
+}
+
+namespace wm {
+
+// Interface for classes that want to be notified about user activity.
+// Implementations should register themselves with UserActivityDetector.
+class WM_EXPORT UserActivityObserver {
+ public:
+  // Invoked periodically while the user is active (i.e. generating input
+  // events). |event| is the event that triggered the notification; it may
+  // be NULL in some cases (e.g. testing or synthetic invocations).
+  virtual void OnUserActivity(const ui::Event* event) = 0;
+
+ protected:
+  UserActivityObserver() {}
+  virtual ~UserActivityObserver() {}
+
+  DISALLOW_COPY_AND_ASSIGN(UserActivityObserver);
+};
+
+}  // namespace wm
+
+#endif  // UI_WM_CORE_USER_ACTIVITY_OBSERVER_H_