lse(map.has('Response'));
  });

  /**
   * Given the root node of a top down multidimensional tree view, returns
   * the node at |path|.
   */
  function getNodeValues_(root, path) {
    let node = root;
    for (let i = 0; i < path.length; i++) {
      for (const component of path[i]) {
        node = node.children[i].get(component);
      }
    }
    return node.values;
  }

  const getCpuUsage_ = nodeValues => nodeValues[0].total;
  const getCpuTotal_ = nodeValues => nodeValues[1].total;

  /**
   * Re