EGLSyncKHR GLSurfaceOzoneSurfaceless::InsertFence() {
  const EGLint attrib_list[] = {EGL_SYNC_CONDITION_KHR,
                                EGL_SYNC_PRIOR_COMMANDS_IMPLICIT_EXTERNAL_ARM,
                                EGL_NONE};
  return eglCreateSyncKHR(GetDisplay(), EGL_SYNC_FENCE_KHR, attrib_list);
}

Unknown