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

examples/wm_flow/wm/wm.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 "examples/wm_flow/wm/frame_controller.h"
 #include "mojo/application/application_runner_chromium.h"
 #include "mojo/public/c/system/main.h"
 #include "mojo/public/cpp/application/application_delegate.h"
 #include "mojo/public/cpp/application/application_impl.h"
 #include "mojo/public/cpp/application/service_provider_impl.h"
@@ skipping 51 matching lines @@
              mojo::ServiceProviderPtr exposed_services) override {
     DCHECK(root_);
     mojo::View* app_view = NULL;
     CreateTopLevelWindow(&app_view);
     app_view->Embed(url, services.Pass(), exposed_services.Pass());
   }
 
   // Overridden from mojo::ViewObserver:
   void OnViewInputEvent(mojo::View* view,
                         const mojo::EventPtr& event) override {
-    if (event->action == mojo::EVENT_TYPE_POINTER_UP &&
-        event->flags & mojo::EVENT_FLAGS_RIGHT_MOUSE_BUTTON &&
+    if (event->action == mojo::EventType::POINTER_UP &&
+        event->flags & mojo::EventFlags::RIGHT_MOUSE_BUTTON &&
         view->parent() == window_container_) {
       CloseWindow(view);
     }
   }
   void OnViewDestroyed(mojo::View* view) override {
     view->RemoveObserver(this);
   }
 
   void CloseWindow(mojo::View* view) {
     mojo::View* first_child = view->children().front();
@@ skipping 66 matching lines @@
 
   DISALLOW_COPY_AND_ASSIGN(SimpleWM);
 };
 
 }  // namespace examples
 
 MojoResult MojoMain(MojoHandle application_request) {
   mojo::ApplicationRunnerChromium runner(new examples::SimpleWM);
   return runner.Run(application_request);
 }