static findLCPNode(graph, lcpRecord) {
    for (const {node} of graph.traverseGenerator()) {
      if (node.type !== 'network') continue;
      if (node.request.requestId === lcpRecord.requestId) {
        return node;
      }
    }
  }
@param {LH.Gatherer.Simulation.GraphNode} graph
@param {NetworkRequest} lcpRecord
@return {LH.Gatherer.Simulation.GraphNetworkNode|undefined}