run aura_demo as a mojo app

mojo/examples/compositor_app/gles2_client_impl.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 "mojo/examples/compositor_app/gles2_client_impl.h"
 
 #include "base/debug/trace_event.h"
 #include "gpu/command_buffer/client/gles2_implementation.h"
 #include "mojo/public/gles2/gles2.h"
 
 namespace mojo {
 namespace examples {
 
 GLES2ClientImpl::GLES2ClientImpl(
     ScopedMessagePipeHandle pipe,
     const base::Callback<void(gfx::Size)>& context_created_callback)
     : context_created_callback_(context_created_callback),
+      impl_(NULL),
       service_(pipe.Pass()) {
   service_.SetPeer(this);
 }
 
 GLES2ClientImpl::~GLES2ClientImpl() { service_->Destroy(); }
 
 void GLES2ClientImpl::DidCreateContext(uint64_t encoded,
                                        uint32_t width,
                                        uint32_t height) {
   TRACE_EVENT0("compositor_app", "DidCreateContext");
   impl_ = reinterpret_cast<gpu::gles2::GLES2Implementation*>(encoded);
   if (!context_created_callback_.is_null())
     context_created_callback_.Run(gfx::Size(width, height));
 }
 
 gpu::gles2::GLES2Interface* GLES2ClientImpl::Interface() const {
   return impl_;
 }
 
 gpu::ContextSupport* GLES2ClientImpl::Support() const {
   return impl_;
 }
 
 void GLES2ClientImpl::ContextLost() { impl_ = NULL; }
 
 }  // namespace examples
 }  // namespace mojo