|  | // 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_EVENTS_INPUT_DEVICE_EVENT_OBSERVER_H_ | 
|  | #define UI_EVENTS_INPUT_DEVICE_EVENT_OBSERVER_H_ | 
|  |  | 
|  | namespace ui { | 
|  |  | 
|  | // DeviceDataManager observer used to announce input hotplug events. | 
|  | class InputDeviceEventObserver { | 
|  | public: | 
|  | virtual ~InputDeviceEventObserver() {} | 
|  |  | 
|  | virtual void OnInputDeviceConfigurationChanged() = 0; | 
|  | }; | 
|  |  | 
|  | }  // namespace ui | 
|  |  | 
|  | #endif  // UI_EVENTS_INPUT_DEVICE_EVENT_OBSERVER_H_ |