ozone: evdev: Add gamepad support

ui/events/devices/device_hotplug_event_observer.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_DEVICES_DEVICE_HOTPLUG_EVENT_OBSERVER_H_
 #define UI_EVENTS_DEVICES_DEVICE_HOTPLUG_EVENT_OBSERVER_H_
 
 #include <vector>
 
 #include "ui/events/devices/events_devices_export.h"
@@ skipping 22 matching lines @@
   // On a hotplug event this is called with the list of available mice. The set
   // of mice may not have changed.
   virtual void OnMouseDevicesUpdated(
       const std::vector<InputDevice>& devices) = 0;
 
   // On a hotplug event this is called with the list of available touchpads. The
   // set of touchpads may not have changed.
   virtual void OnTouchpadDevicesUpdated(
       const std::vector<InputDevice>& devices) = 0;
 
+  // On a hotplug event this is called with the list of available gamepads.The
+  // set of gamepads may not have changed.
+  virtual void OnGamepadDevicesUpdated(
+      const std::vector<InputDevice>& devices) = 0;
+
   // On completion of the initial startup scan. This means all of the above
   // OnDevicesUpdated() methods have been called with a complete list.
   virtual void OnDeviceListsComplete() = 0;
 
   // The stylus was removed or inserted into the device; |state| contains the
   // new stylus state.
   virtual void OnStylusStateChanged(StylusState state) = 0;
 };
 
 }  // namespace ui
 
 #endif  // UI_EVENTS_DEVICES_DEVICE_HOTPLUG_EVENT_OBSERVER_H_