ozone: evdev: Add gamepad support

services/ui/public/interfaces/input_devices/input_device_server.mojom

Index: services/ui/public/interfaces/input_devices/input_device_server.mojom
diff --git a/services/ui/public/interfaces/input_devices/input_device_server.mojom b/services/ui/public/interfaces/input_devices/input_device_server.mojom
index bcd83a668ba887af5b53f6d4e0fe5a3cbfab8b6d..04bc6401a2c5d97202f21a783e3ce08602e8387b 100644
--- a/services/ui/public/interfaces/input_devices/input_device_server.mojom
+++ b/services/ui/public/interfaces/input_devices/input_device_server.mojom
@@ -22,13 +22,17 @@ interface InputDeviceObserverMojo {
   // Is called when the list of touchpads changes.
   OnTouchpadDeviceConfigurationChanged(array<ui.mojom.InputDevice> devices);
 
+  // Is called when the list of gamepads changes.
+  OnGamepadDeviceConfigurationChanged(array<ui.mojom.InputDevice> devices);
+
   // Is called once all of the input-device lists are available. This will
   // always be the first call that an observer receives.
   OnDeviceListsComplete(
       array<ui.mojom.InputDevice> keyboard_devices,
       array<ui.mojom.TouchscreenDevice> touchscreen_devices,
       array<ui.mojom.InputDevice> mouse_devices,
-      array<ui.mojom.InputDevice> touchpad_devices);
+      array<ui.mojom.InputDevice> touchpad_devices,
+      array<ui.mojom.InputDevice> gamepad_devices);
 
   // Is called when a stylus is removed or inserted into the device.
   OnStylusStateChanged(StylusState state);