ozone: evdev: Add gamepad support

ui/events/ozone/evdev/event_factory_evdev.h

Index: ui/events/ozone/evdev/event_factory_evdev.h
diff --git a/ui/events/ozone/evdev/event_factory_evdev.h b/ui/events/ozone/evdev/event_factory_evdev.h
index 7213204ba09106808b30c8ff6be726e869656477..298018607559df7100fd2370decf790274f3583f 100644
--- a/ui/events/ozone/evdev/event_factory_evdev.h
+++ b/ui/events/ozone/evdev/event_factory_evdev.h
@@ -65,6 +65,7 @@ class EVENTS_OZONE_EVDEV_EXPORT EventFactoryEvdev : public DeviceEventObserver,
   InputControllerEvdev* input_controller() { return &input_controller_; }
 
   // User input events.
+  void DispatchGamepadEvent(const GamepadEventParams& params);
   void DispatchKeyEvent(const KeyEventParams& params);
   void DispatchMouseMoveEvent(const MouseMoveEventParams& params);
   void DispatchMouseButtonEvent(const MouseButtonEventParams& params);
@@ -74,6 +75,7 @@ class EVENTS_OZONE_EVDEV_EXPORT EventFactoryEvdev : public DeviceEventObserver,
   void DispatchTouchEvent(const TouchEventParams& params);
 
   // Device lifecycle events.
+  void DispatchGamepadDevicesUpdated(const std::vector<InputDevice>& devices);
   void DispatchKeyboardDevicesUpdated(const std::vector<InputDevice>& devices);
   void DispatchTouchscreenDevicesUpdated(
       const std::vector<TouchscreenDevice>& devices);