Move NullDraw GL bindings and allow them to be disabled temporarily.

ui/gl/gl_bindings.h

Index: ui/gl/gl_bindings.h
diff --git a/ui/gl/gl_bindings.h b/ui/gl/gl_bindings.h
index 74e20fe5f05a3c816acd293e3659160c223471e7..cf1435fc4beace0b3a741538a0f194b631ce6864 100644
--- a/ui/gl/gl_bindings.h
+++ b/ui/gl/gl_bindings.h
@@ -229,12 +229,14 @@ struct GL_EXPORT DriverGL {
   void InitializeCustomDynamicBindings(GLContext* context);
   void InitializeDebugBindings();
   void InitializeNullDrawBindings();
+  bool SetNullDrawBindingsEnabled(bool enabled);
   void ClearBindings();
 
   ProcsGL fn;
   ProcsGL orig_fn;
   ProcsGL debug_fn;
   ExtensionsGL ext;
+  bool null_draw_bindings_enabled;
 
  private:
   void InitializeDynamicBindings(GLContext* context);