Change ui cursor identifiers to an enum class.

services/ui/public/interfaces/cursor/cursor_struct_traits.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 SERVICES_UI_PUBLIC_INTERFACES_CURSOR_CURSOR_STRUCT_TRAITS_H_
 #define SERVICES_UI_PUBLIC_INTERFACES_CURSOR_CURSOR_STRUCT_TRAITS_H_
 
 #include "services/ui/public/interfaces/cursor/cursor.mojom-shared.h"
 #include "ui/base/cursor/cursor_data.h"
 
 namespace mojo {
 
 template <>
+struct EnumTraits<ui::mojom::CursorType, ui::CursorType> {
+  static ui::mojom::CursorType ToMojom(ui::CursorType input);
+  static bool FromMojom(ui::mojom::CursorType input, ui::CursorType* out);
+};
+
+template <>
 struct StructTraits<ui::mojom::CursorDataDataView, ui::CursorData> {
-  static ui::mojom::CursorType cursor_type(const ui::CursorData& c) {
-    return ui::mojom::CursorType(c.cursor_type());
+  static ui::CursorType cursor_type(const ui::CursorData& c) {
+    return c.cursor_type();
   }
   static const base::TimeDelta& frame_delay(const ui::CursorData& c);
   static const gfx::Point& hotspot_in_pixels(const ui::CursorData& c);
   static const std::vector<SkBitmap>& cursor_frames(const ui::CursorData& c);
   static float scale_factor(const ui::CursorData& c) {
     return c.scale_factor();
   }
   static bool Read(ui::mojom::CursorDataDataView data, ui::CursorData* out);
 };
 
 }  // namespace mojo
 
 #endif  // SERVICES_UI_PUBLIC_INTERFACES_CURSOR_CURSOR_STRUCT_TRAITS_H_