Respect the disabled extension list during binding initialization.

ui/gl/gl_glx_api_implementation.cc

Index: ui/gl/gl_glx_api_implementation.cc
diff --git a/ui/gl/gl_glx_api_implementation.cc b/ui/gl/gl_glx_api_implementation.cc
index cd38fd88806041066b3cd0c793afe5d72e9b1374..670e86c2ac62709721ef718ec1d8c3319660efda 100644
--- a/ui/gl/gl_glx_api_implementation.cc
+++ b/ui/gl/gl_glx_api_implementation.cc
@@ -16,6 +16,7 @@ void InitializeStaticGLBindingsGLX() {
   }
   g_real_glx->Initialize(&g_driver_glx);
   g_current_glx_context = g_real_glx;
+  g_driver_glx.InitializeExtensionBindings(g_real_glx->GetEnabledExtensions());
 }
 
 void InitializeDebugGLBindingsGLX() {
@@ -58,6 +59,23 @@ 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() {
 }