Restore tooltip, now it works onsingle result only

benchmark/website/source/utils.js

@@ -55,6 +55,7 @@ function buildChart(ctx, bare_data) {
     for (value of dataset.data) {
       max_value = Math.max(max_value, value);
     }
+    index++;
   }
   window.myBar = new Chart(
       ctx,
@@ -73,7 +74,7 @@ function buildChart(ctx, bare_data) {
                                                   labelString: 'Render time (sec)'},
                                      ticks: {min: 0,
                                              max: Math.ceil(max_value * 1.25)}}]},
-                   tooltips: {mode: 'index',
+                   tooltips: {// mode: 'index',
                               callbacks: {
                                 footer: function(tooltipItems, data) {
                                   var human_time = "";