Add generic mapping for gamepad

ui/events/ozone/gamepad/generic_gamepad_mapping.h

+// Copyright 2017 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef UI_EVENTS_OZONE_GENERIC_GAMEPAD_GAMEPAD_MAPPING_H_
+#define UI_EVENTS_OZONE_GENERIC_GAMEPAD_GAMEPAD_MAPPING_H_
+
+#include <vector>
+#include "ui/events/ozone/evdev/events_ozone_evdev_export.h"
+#include "ui/events/ozone/gamepad/gamepad_mapping.h"
+
+namespace ui {
+
+class EventDeviceInfo;
+
+std::unique_ptr<GamepadMapper> EVENTS_OZONE_EVDEV_EXPORT
+BuildGenericGamepadMapper(const EventDeviceInfo& info);
+
+}  // namespace ui
+
+#endif  // UI_EVENTS_OZONE_GENERIC_GAMEPAD_GAMEPAD_MAPPING_H_