m {!tr.b.MultiDimensionalViewNode} rootNode
     * @param {!tr.v.HistogramSet} histogramSet
     */
    addTreeValuesToHistogramSet(rootNode, histogramSet) {
      const rootPath = [[], [], []];
      this.rootNode_ = rootNode;
      this.histogramSet_ = histogramSet;
      this.reportDataFromTree_(this.rootNode_, rootPath);
    }

    /**
     * Reports values from the multidimensional tree view rooted at |rootNode|
     * as single value histograms in |histogramSet|.
     *
     * The histograms are dynam