ozone: evdev: Add gamepad support

ui/events/devices/device_data_manager.cc

Index: ui/events/devices/device_data_manager.cc
diff --git a/ui/events/devices/device_data_manager.cc b/ui/events/devices/device_data_manager.cc
index 38a184cf91c40a18ddfa533b055dac5aba3fa4b9..9f0fe8eb2a01b660d091751b37a6a2006ad22fbe 100644
--- a/ui/events/devices/device_data_manager.cc
+++ b/ui/events/devices/device_data_manager.cc
@@ -151,6 +151,10 @@ const std::vector<InputDevice>& DeviceDataManager::GetTouchpadDevices() const {
   return touchpad_devices_;
 }
 
+const std::vector<InputDevice>& DeviceDataManager::GetGamepadDevices() const {
+  return gamepad_devices_;
+}
+
 bool DeviceDataManager::AreDeviceListsComplete() const {
   return device_lists_complete_;
 }
@@ -214,6 +218,17 @@ void DeviceDataManager::OnTouchpadDevicesUpdated(
   NotifyObserversTouchpadDeviceConfigurationChanged();
 }
 
+void DeviceDataManager::OnGamepadDevicesUpdated(
+    const std::vector<InputDevice>& devices) {
+  if (devices.size() == gamepad_devices_.size() &&
+      std::equal(devices.begin(), devices.end(), gamepad_devices_.begin(),
+                 InputDeviceEquals)) {
+    return;
+  }
+  gamepad_devices_ = devices;
+  NotifyObserversGamepadDeviceConfigurationChanged();
+}
+
 void DeviceDataManager::OnDeviceListsComplete() {
   if (!device_lists_complete_) {
     device_lists_complete_ = true;
@@ -237,6 +252,9 @@ NOTIFY_OBSERVERS(NotifyObserversMouseDeviceConfigurationChanged(),
 NOTIFY_OBSERVERS(NotifyObserversTouchpadDeviceConfigurationChanged(),
                  OnTouchpadDeviceConfigurationChanged());
 
+NOTIFY_OBSERVERS(NotifyObserversGamepadDeviceConfigurationChanged(),
+                 OnGamepadDeviceConfigurationChanged());
+
 NOTIFY_OBSERVERS(NotifyObserversDeviceListsComplete(), OnDeviceListsComplete());
 
 NOTIFY_OBSERVERS(NotifyObserversStylusStateChanged(StylusState state),