If I have it correctly, 'chdlp=bv' puts the chart legend in a vertical list 
at the bottom of the chart in the Image Charts API.  If so, you can't quite 
do that with the Visualization API charts.  Setting the legend.position 
option to 'top' or 'bottom' creates a horizontal legend, while setting it 
to 'right' creates a vertical legend.

You are also using the legend option incorrectly; it should be:

var options = {
          width: 800, height: 600,
          title: 'HLR Performance',
          legend: {
                    position: 'top'
          }
};

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