// TODO(user): Rather than returning charts from both servers, let's just
// do it on the client's end.
Plot countPlot = Plots.newBarChartPlot(countData);
BarChart countChart = GCharts.newBarChart(countPlot);
countChart.addYAxisLabels(AxisLabelsFactory.newNumericRangeAxisLabels(0, maxPlusOne));
countChart.addXAxisLabels(AxisLabelsFactory.newAxisLabels(countLabels));
countChart.setSize(getChartWidth(workerCallCounts.length), 200);
countChart.setBarWidth(BarChart.AUTO_RESIZE);
countChart.setSpaceBetweenGroupsOfBars(1);
return countChart.toURLString();
}