Status RecordResult(
        const Edge* edge,
        const absl::flat_hash_map<const Node*, Node*>& node_images);

    // Creates the sequencer node if it doesn't exist, adding it to graph_out.
    Status MakeSequencingNode(const string& subgraph_name, Graph* graph_out);

    // If there is a sequencer node, adds a control edge from the sequencer to
    // the call node.
    void ConnectSequencerToCallNode(Graph* graph_out);