Respect the disabled extension list during binding initialization.

ui/gl/gl_glx_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_glx_api_implementation.h"
 #include "ui/gl/gl_implementation.h"
 
 namespace gfx {
 
 RealGLXApi* g_real_glx;
 
 void InitializeStaticGLBindingsGLX() {
   g_driver_glx.InitializeStaticBindings();
   if (!g_real_glx) {
     g_real_glx = new RealGLXApi();
   }
   g_real_glx->Initialize(&g_driver_glx);
   g_current_glx_context = g_real_glx;
+  g_driver_glx.InitializeExtensionBindings(g_real_glx->GetEnabledExtensions());
 }
 
 void InitializeDebugGLBindingsGLX() {
   g_driver_glx.InitializeDebugBindings();
 }
 
 void ClearGLBindingsGLX() {
   if (g_real_glx) {
     delete g_real_glx;
     g_real_glx = NULL;
@@ skipping 22 matching lines @@
 RealGLXApi::RealGLXApi() {
 }
 
 RealGLXApi::~RealGLXApi() {
 }
 
 void RealGLXApi::Initialize(DriverGLX* driver) {
   InitializeBase(driver);
 }
 
+std::set<std::string> RealGLXApi::GetEnabledExtensions() const {
+  std::set<std::string> enabled_extensions;
+
+  std::vector<std::string> platform_extensions_vec;
+  std::string platform_ext = DriverGLX::GetPlatformExtensions();
+  base::SplitString(platform_ext, ' ', &platform_extensions_vec);
+
+  enabled_extensions.insert(platform_extensions_vec.begin(),
+                            platform_extensions_vec.end());
+
+  for (auto ext : disabled_exts_) {
+    enabled_extensions.erase(ext);
+  }
+
+  return enabled_extensions;
+}
+
 TraceGLXApi::~TraceGLXApi() {
 }
 
 bool GetGLWindowSystemBindingInfoGLX(GLWindowSystemBindingInfo* info) {
   Display* display = glXGetCurrentDisplay();
   const int kDefaultScreen = 0;
   const char* vendor =
       glXQueryServerString(display, kDefaultScreen, GLX_VENDOR);
   const char* version =
       glXQueryServerString(display, kDefaultScreen, GLX_VERSION);
   const char* extensions =
       glXQueryServerString(display, kDefaultScreen, GLX_EXTENSIONS);
   *info = GLWindowSystemBindingInfo();
   if (vendor)
     info->vendor = vendor;
   if (version)
     info->version = version;
   if (extensions)
     info->extensions = extensions;
   info->direct_rendering = !!glXIsDirect(display, glXGetCurrentContext());
   return true;
 }
 
 }  // namespace gfx