Add GetProcAddress to OpenGL control interface

mojo/gles2/control_thunks_impl.cc

 // Copyright 2015 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/gles2/control_thunks_impl.h"
 
 #include "mojo/gles2/gles2_context.h"
 #include "mojo/public/cpp/system/message_pipe.h"
 
+extern "C" {
+
+#define VISIT_GL_CALL(Function, ReturnType, PARAMETERS, ARGUMENTS) \
+  ReturnType MojoGLES2gl##Function PARAMETERS;
+#include "mojo/public/platform/native/gles2/call_visitor.h"
+#undef VISIT_GL_CALL
+
+}
+
 namespace gles2 {
 
 // static
 ControlThunksImpl* ControlThunksImpl::Get() {
   static base::LazyInstance<ControlThunksImpl>::Leaky thunks;
   return thunks.Pointer();
 }
 
 MGLContext ControlThunksImpl::CreateContext(
     MGLOpenGLAPIVersion version,
@@ skipping 25 matching lines @@
 }
 
 void ControlThunksImpl::ResizeSurface(uint32_t width, uint32_t height) {
   current_context_tls_.Get()->interface()->ResizeCHROMIUM(width, height, 1.f);
 }
 
 void ControlThunksImpl::SwapBuffers() {
   current_context_tls_.Get()->interface()->SwapBuffers();
 }
 
+
+MGLMustCastToProperFunctionPointerType ControlThunksImpl::GetProcAddress(
+    const char* name) {
+#define VISIT_GL_CALL(Function, ReturnType, PARAMETERS, ARGUMENTS) \
+  if (!strcmp(name, "gl"#Function)) \
+    return reinterpret_cast<MGLMustCastToProperFunctionPointerType>( \
+        MojoGLES2gl##Function);
+#include "mojo/public/platform/native/gles2/call_visitor.h"
+#undef VISIT_GL_CALL
+  return nullptr;
+}
+
 void* ControlThunksImpl::GetGLES2Interface(MGLContext context) {
   GLES2Context* client = reinterpret_cast<GLES2Context*>(context);
   DCHECK(client);
   return client->interface();
 }
 
 void ControlThunksImpl::SignalSyncPoint(
     uint32_t sync_point,
     MGLSignalSyncPointCallback callback,
     void* closure) {
   current_context_tls_.Get()->context_support()->SignalSyncPoint(
       sync_point, base::Bind(callback, closure));
 }
 
 gpu::gles2::GLES2Interface* ControlThunksImpl::CurrentGLES2Interface() {
   if (!current_context_tls_.Get())
     return nullptr;
   return current_context_tls_.Get()->interface();
 }
 
 ControlThunksImpl::ControlThunksImpl() {
 }
 
 ControlThunksImpl::~ControlThunksImpl() {
 }
 
 }  // namespace gles2