Respect the disabled extension list during binding initialization.

ui/gl/gl_osmesa_api_implementation.cc

 // Copyright (c) 2012 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 "ui/gl/gl_osmesa_api_implementation.h"
 
 namespace gfx {
 
 RealOSMESAApi* g_real_osmesa;
 
 void InitializeStaticGLBindingsOSMESA() {
   g_driver_osmesa.InitializeStaticBindings();
   if (!g_real_osmesa) {
     g_real_osmesa = new RealOSMESAApi();
   }
   g_real_osmesa->Initialize(&g_driver_osmesa);
   g_current_osmesa_context = g_real_osmesa;
+  g_driver_osmesa.InitializeExtensionBindings();
 }
 
 void InitializeDebugGLBindingsOSMESA() {
   g_driver_osmesa.InitializeDebugBindings();
 }
 
 void ClearGLBindingsOSMESA() {
   if (g_real_osmesa) {
     delete g_real_osmesa;
     g_real_osmesa = NULL;
@@ skipping 28 matching lines @@
 void RealOSMESAApi::Initialize(DriverOSMESA* driver) {
   InitializeBase(driver);
 }
 
 TraceOSMESAApi::~TraceOSMESAApi() {
 }
 
 }  // namespace gfx