void ResourceDispatcherHostImpl::OnRenderViewHostSetIsLoading(int child_id,
                                                              int route_id,
                                                              bool is_loading) {
  scheduler_->OnLoadingStateChanged(child_id, route_id, !is_loading);
}

The product contains a concurrent code sequence that requires temporary, exclusive access to a shared resource, but a timing window exists in which the shared resource can be modified by another code sequence operating concurrently.