[mojo-bindings] Support reuse of native enum classes

components/mus/public/interfaces/cc.typemap

 // Copyright 2016 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.
 
-// Mojom typemap for consumers of Mojo services that use Skia types.
-
 {
   "c++": {
-    "skia.Bitmap": {
-      "typename": "SkBitmap",
+    "mus.mojom.ResourceFormat": {
+      "typename": "cc::ResourceFormat",
       "headers": [
-        "third_party/skia/include/core/SkBitmap.h",
-        "ui/gfx/ipc/gfx_param_traits.h"
+        "cc/resources/resource_format.h"
       ]
     }
   }
 }