Adds special support to the device manager for keyboards devices.

ui/events/x/hotplug_event_handler_x11.h

 // 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_X_HOTPLUG_EVENT_HANDLER_H_
 #define UI_EVENTS_X_HOTPLUG_EVENT_HANDLER_H_
 
 #include "ui/events/x/device_list_cache_x.h"
 
 namespace ui {
 
 class DeviceHotplugEventObserver;
 
 // Parses X11 native devices and propagates the list of active devices to an
 // observer.
 class EVENTS_BASE_EXPORT HotplugEventHandlerX11 {
  public:
   explicit HotplugEventHandlerX11(DeviceHotplugEventObserver* delegate);
   ~HotplugEventHandlerX11();
 
   // Called on an X11 hotplug event.
   void OnHotplugEvent();
 
  private:
   void HandleTouchscreenDevices(const XIDeviceList& device_list);
+  void HandleKeyboardDevices(const XIDeviceList& device_list);
 
   DeviceHotplugEventObserver* delegate_;  // Not owned.
 
   DISALLOW_COPY_AND_ASSIGN(HotplugEventHandlerX11);
 };
 
 }  // namespace ui
 
 #endif  // UI_EVENTS_X_HOTPLUG_EVENT_HANDLER_H_