For c++, Generate enum classes instead of enum from mojom.

examples/nfc_sender/nfc_sender.cc

 // Copyright 2015 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.
 
 #include "base/bind.h"
 #include "base/macros.h"
 #include "mojo/application/application_runner_chromium.h"
 #include "mojo/common/binding_set.h"
 #include "mojo/gpu/gl_texture.h"
 #include "mojo/gpu/texture_cache.h"
@@ skipping 186 matching lines @@
       paint.setFlags(SkPaint::kAntiAlias_Flag);
       canvas->drawCircle(circle.point.x(), circle.point.y(), 50, paint);
     }
 
     canvas->flush();
   }
 
   // mojo::ViewObserver
   void OnViewInputEvent(mojo::View* view,
                         const mojo::EventPtr& event) override {
-    if (event->action == mojo::EVENT_TYPE_POINTER_DOWN ||
-        event->action == mojo::EVENT_TYPE_POINTER_MOVE) {
+    if (event->action == mojo::EventType::POINTER_DOWN ||
+        event->action == mojo::EventType::POINTER_MOVE) {
       if (event->pointer_data) {
         gfx::Point point(event->pointer_data->x, event->pointer_data->y);
 
         int r = rand() % 256;
         int g = rand() % 256;
         int b = rand() % 256;
         CircleData circle_data;
         circle_data.point = point;
         circle_data.color = SkColorSetARGB(0xFF, r, g, b);
         circles_.push_back(circle_data);
@@ skipping 95 matching lines @@
 
   DISALLOW_COPY_AND_ASSIGN(NfcSenderDelegate);
 };
 
 }  // namespace examples
 
 MojoResult MojoMain(MojoHandle application_request) {
   mojo::ApplicationRunnerChromium runner(new examples::NfcSenderDelegate);
   return runner.Run(application_request);
 }