Make async waiter explicit MojoGLES2CreateContext param

mojo/examples/sample_app/sample_app.cc

 // Copyright 2013 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 <stdio.h>
 #include <string>
 
 #include "mojo/examples/sample_app/gles2_client_impl.h"
 #include "mojo/public/cpp/application/application_connection.h"
 #include "mojo/public/cpp/application/application_delegate.h"
 #include "mojo/public/cpp/application/application_impl.h"
-#include "mojo/public/cpp/gles2/gles2.h"
 #include "mojo/public/cpp/system/core.h"
 #include "mojo/public/cpp/system/macros.h"
 #include "mojo/public/cpp/utility/run_loop.h"
 #include "mojo/services/public/interfaces/native_viewport/native_viewport.mojom.h"
 
 namespace examples {
 
 class SampleApp : public mojo::ApplicationDelegate,
                   public mojo::NativeViewportClient {
  public:
@@ skipping 40 matching lines @@
 
   virtual void OnEvent(mojo::EventPtr event,
                        const mojo::Callback<void()>& callback) MOJO_OVERRIDE {
     assert(event);
     if (event->location)
       gles2_client_->HandleInputEvent(*event);
     callback.Run();
   }
 
  private:
-  mojo::GLES2Initializer gles2;
   scoped_ptr<GLES2ClientImpl> gles2_client_;
   mojo::NativeViewportPtr viewport_;
 
   DISALLOW_COPY_AND_ASSIGN(SampleApp);
 };
 
 }  // namespace examples
 
 namespace mojo {
 
 // static
 ApplicationDelegate* ApplicationDelegate::Create() {
   return new examples::SampleApp();
 }
 
 }  // namespace mojo