Add generic mapping for gamepad

ui/events/ozone/gamepad/static_gamepad_mapping.h

Index: ui/events/ozone/gamepad/static_gamepad_mapping.h
diff --git a/ui/events/ozone/gamepad/static_gamepad_mapping.h b/ui/events/ozone/gamepad/static_gamepad_mapping.h
new file mode 100644
index 0000000000000000000000000000000000000000..f1cb3bf70783b7107a30ad86f73f0dd5a8a1c95a
--- /dev/null
+++ b/ui/events/ozone/gamepad/static_gamepad_mapping.h
@@ -0,0 +1,21 @@
+// 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_STATIC_GAMEPAD_GAMEPAD_MAPPING_H_
+#define UI_EVENTS_OZONE_STATIC_GAMEPAD_GAMEPAD_MAPPING_H_
+
+#include "ui/events/ozone/evdev/events_ozone_evdev_export.h"
+#include "ui/events/ozone/gamepad/gamepad_mapping.h"
+#include "ui/events/ozone/gamepad/webgamepad_constants.h"
+
+namespace ui {
+
+// This function gets the static mapper for the gamepad vendor_id and
+// product_id.
+GamepadMapper* EVENTS_OZONE_EVDEV_EXPORT
+GetStaticGamepadMapper(uint16_t vendor_id, uint16_t product_id);
+
+}  // namespace ui
+
+#endif  // UI_EVENTS_OZONE_STATIC_GAMEPAD_GAMEPAD_MAPPING_H_