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

examples/nesting_app/nesting_app.cc

 // Copyright 2014 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 "base/message_loop/message_loop.h"
 #include "base/strings/stringprintf.h"
 #include "examples/bitmap_uploader/bitmap_uploader.h"
 #include "examples/window_manager/window_manager.mojom.h"
@@ skipping 66 matching lines @@
   void OnViewManagerDisconnected(ViewManager* view_manager) override {
    base::MessageLoop::current()->Quit();
   }
 
   // Overridden from ViewObserver:
   void OnViewDestroyed(View* view) override {
     // TODO(beng): reap views & child Views.
     nested_ = NULL;
   }
   void OnViewInputEvent(View* view, const EventPtr& event) override {
-    if (event->action == EVENT_TYPE_POINTER_UP)
+    if (event->action == EventType::POINTER_UP)
       window_manager_->CloseWindow(view->id());
   }
 
   scoped_ptr<ViewManagerClientFactory> view_manager_client_factory_;
 
   View* nested_;
   Shell* shell_;
   ::examples::IWindowManagerPtr window_manager_;
   scoped_ptr<BitmapUploader> bitmap_uploader_;
 
   DISALLOW_COPY_AND_ASSIGN(NestingApp);
 };
 
 }  // namespace examples
 }  // namespace mojo
 
 MojoResult MojoMain(MojoHandle application_request) {
   mojo::ApplicationRunnerChromium runner(new mojo::examples::NestingApp);
   return runner.Run(application_request);
 }