Path);

      for (let dimension = 0; dimension < root.children.length; dimension++) {
        const children = root.children[dimension];
        for (const [name, node] of children) {
          const childPath = clonePath_(rootPath);
          childPath[dimension].push(name);
          this.reportDataFromTree_(node, childPath);
        }
      }
    }

    /**
     * Adds values from the multidimensional tree view rooted at |rootNode| as
     * single value histograms in |histogramSet|.
     *
     * @para