ozone: evdev: Add gamepad support

ui/events/ozone/BUILD.gn

Index: ui/events/ozone/BUILD.gn
diff --git a/ui/events/ozone/BUILD.gn b/ui/events/ozone/BUILD.gn
index 11a7d388fe82dedf769e3f9e1ea8a86e03536e6e..8809831be8d1856b9e01067e67853b54ed7fc70e 100644
--- a/ui/events/ozone/BUILD.gn
+++ b/ui/events/ozone/BUILD.gn
@@ -83,6 +83,8 @@ if (use_ozone) {
       "evdev/event_thread_evdev.cc",
       "evdev/event_thread_evdev.h",
       "evdev/events_ozone_evdev_export.h",
+      "evdev/gamepad_event_converter_evdev.cc",
+      "evdev/gamepad_event_converter_evdev.h",
       "evdev/input_controller_evdev.cc",
       "evdev/input_controller_evdev.h",
       "evdev/input_device_factory_evdev.cc",
@@ -120,6 +122,14 @@ if (use_ozone) {
       "evdev/touch_filter/single_position_touch_noise_filter.cc",
       "evdev/touch_filter/single_position_touch_noise_filter.h",
       "evdev/touch_filter/touch_filter.h",
+      "gamepad/gamepad_event.cc",
+      "gamepad/gamepad_event.h",
+      "gamepad/gamepad_mapping.cc",
+      "gamepad/gamepad_mapping.h",
+      "gamepad/gamepad_observer.h",
+      "gamepad/gamepad_provider_ozone.cc",
+      "gamepad/gamepad_provider_ozone.h",
+      "gamepad/webgamepad_constants.h",
     ]
 
     defines = [ "EVENTS_OZONE_EVDEV_IMPLEMENTATION" ]