ozone: evdev: Add gamepad support

ui/events/ozone/evdev/input_device_factory_evdev.h

Index: ui/events/ozone/evdev/input_device_factory_evdev.h
diff --git a/ui/events/ozone/evdev/input_device_factory_evdev.h b/ui/events/ozone/evdev/input_device_factory_evdev.h
index b4ff3339827b8eed2b3147e983046f4dc5584afc..ddfbc999ae6c6401489288439bb7dcbff02a0f57 100644
--- a/ui/events/ozone/evdev/input_device_factory_evdev.h
+++ b/ui/events/ozone/evdev/input_device_factory_evdev.h
@@ -90,6 +90,7 @@ class EVENTS_OZONE_EVDEV_EXPORT InputDeviceFactoryEvdev {
   void NotifyTouchscreensUpdated();
   void NotifyMouseDevicesUpdated();
   void NotifyTouchpadDevicesUpdated();
+  void NotifyGamepadDevicesUpdated();
 
   void SetIntPropertyForOneType(const EventDeviceType type,
                                 const std::string& name,
@@ -118,6 +119,7 @@ class EVENTS_OZONE_EVDEV_EXPORT InputDeviceFactoryEvdev {
   bool keyboard_list_dirty_ = true;
   bool mouse_list_dirty_ = true;
   bool touchpad_list_dirty_ = true;
+  bool gamepad_list_dirty_ = true;
 
   // Whether we have a list of devices that were present at startup.
   bool startup_devices_enumerated_ = false;