code: private PointSeries toVersionSeries(final List<BrowserUsageData> browserUsage) {
      PointSeries versionSeries = new PointSeries();
      for (BrowserUsageData browserData : browserUsage) {
        for (VersionUsageData versionData : browserData
            .getVersionUsageData()) {
          versionSeries
              .addPoint(new Point(versionData
                  .getName(), versionData
                  .getMarketShare(), versionData
                  .getColor()));
        }
      }
      return versionSeries;
    }
docs: Converts a list of {@link BrowserUsageData} into a list of
  {@link PointSeries} containing the data about the browser versions.