Impl mus::mojom::GpuService to enable using Chrome IPC version gpu CmdBuf in mus

mojo/gles2/gles2_impl.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 <stdint.h>
 
 #include <utility>
 
 #include "base/lazy_instance.h"
 #include "base/threading/thread_local.h"
@@ skipping 10 matching lines @@
 namespace {
 
 const int32_t kNone = 0x3038;  // EGL_NONE
 
 base::LazyInstance<base::ThreadLocalPointer<gpu::gles2::GLES2Interface> >::Leaky
     g_gpu_interface;
 
 }  // namespace
 
 extern "C" {
+
 MojoGLES2Context MojoGLES2CreateContext(MojoHandle handle,
                                         const int32_t* attrib_list,
                                         MojoGLES2ContextLost lost_callback,
                                         void* closure) {
   mojo::MessagePipeHandle mph(handle);
   mojo::ScopedMessagePipeHandle scoped_handle(mph);
   std::vector<int32_t> attribs;
   if (attrib_list) {
     for (int32_t const* p = attrib_list; *p != kNone;) {
       attribs.push_back(*p++);
@@ skipping 38 matching lines @@
 #define VISIT_GL_CALL(Function, ReturnType, PARAMETERS, ARGUMENTS) \
   ReturnType GL_APIENTRY gl##Function PARAMETERS {                 \
     DCHECK(g_gpu_interface.Get().Get());                           \
     return g_gpu_interface.Get().Get()->Function ARGUMENTS;        \
   }
 #include "mojo/public/c/gles2/gles2_call_visitor_autogen.h"
 #include "mojo/public/c/gles2/gles2_call_visitor_chromium_extension_autogen.h"
 #undef VISIT_GL_CALL
 
 }  // extern "C"