this));
      }
      this.row.viewState.addUpdateListener(this.onRowStateUpdate_.bind(this));
      if (this.isAttached) {
        this.row.rootViewState.addUpdateListener(this.rootListener_);
      }

      this.updateMwu_();

      // this.histogram_ and this.referenceHistogram might be undefined,
      // a HistogramSet of unmergeable Histograms, or a Histogram.
      this.updateContents_();
    },

    updateSignificance_() {
      if (!this.mwuResult_) return;
      this.$.scalar.significance = this.m