Respect the disabled extension list during binding initialization.

ui/gl/gl_gl_api_implementation.cc

Index: ui/gl/gl_gl_api_implementation.cc
diff --git a/ui/gl/gl_gl_api_implementation.cc b/ui/gl/gl_gl_api_implementation.cc
index a8d4dbe0c0de5ecda49b59c5f38fc26a214ec453..f7f7cf51901db0af56d544e90d5f06f675164ee3 100644
--- a/ui/gl/gl_gl_api_implementation.cc
+++ b/ui/gl/gl_gl_api_implementation.cc
@@ -211,7 +211,8 @@ static void GL_BINDING_CALL CustomRenderbufferStorageMultisampleEXT(
 }  // anonymous namespace
 
 void DriverGL::InitializeCustomDynamicBindings(GLContext* context) {
-  InitializeDynamicBindings(context);
+  InitializeExtensionBindings(context,
+                              g_real_gl->GetEnabledExtensions(context));
 
   DCHECK(orig_fn.glTexImage2DFn == NULL);
   orig_fn.glTexImage2DFn = fn.glTexImage2DFn;
@@ -450,6 +451,24 @@ const GLubyte* RealGLApi::glGetStringiFn(GLenum name, GLuint index) {
   return GLApiBase::glGetStringiFn(name, index);
 }
 
+std::set<std::string> RealGLApi::GetEnabledExtensions(
+    GLContext* context) const {
+  std::set<std::string> enabled_extensions;
+
+  std::vector<std::string> platform_extensions_vec;
+  std::string platform_ext = context->GetExtensions();
+  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;
+}
+
 void RealGLApi::glFlushFn() {
   GLApiBase::glFlushFn();
 }