Refactor NumericBuilder to HistogramBinBoundaries.

tracing/tracing/metrics/system_health/rail_power_metric.html

Index: tracing/tracing/metrics/system_health/rail_power_metric.html
diff --git a/tracing/tracing/metrics/system_health/rail_power_metric.html b/tracing/tracing/metrics/system_health/rail_power_metric.html
index a388f0eacacd7fbe282f5f06b34bfe443bc7f398..6a9159fd654cf2315cad5faf0e3556529936ae92 100644
--- a/tracing/tracing/metrics/system_health/rail_power_metric.html
+++ b/tracing/tracing/metrics/system_health/rail_power_metric.html
@@ -16,18 +16,6 @@ found in the LICENSE file.
 'use strict';
 
 tr.exportTo('tr.metrics.sh', function() {
-  var TIME_NUMERIC_BUILDER = tr.v.NumericBuilder.createExponential(
-      tr.v.Unit.byName.timeDurationInMs_smallerIsBetter,
-      tr.b.Range.fromExplicitRange(1e-3, 1e6), 50);
-
-  var ENERGY_NUMERIC_BUILDER = tr.v.NumericBuilder.createExponential(
-      tr.v.Unit.byName.energyInJoules_smallerIsBetter,
-      tr.b.Range.fromExplicitRange(1e-3, 1e3), 50);
-
-  var POWER_NUMERIC_BUILDER = tr.v.NumericBuilder.createExponential(
-      tr.v.Unit.byName.powerInWatts_smallerIsBetter,
-      tr.b.Range.fromExplicitRange(1e-3, 1e3), 50);
-
   function railPowerMetricHelper(values, model) {
     var railStageTimes = new Map();
     var railStageEnergy = new Map();
@@ -54,21 +42,24 @@ tr.exportTo('tr.metrics.sh', function() {
           tr.v.UnitScale.Metric.MILLI, tr.v.UnitScale.Metric.NONE);
       var powerInW = energyInJ / durationInS;
 
-      var durationHist = TIME_NUMERIC_BUILDER.build();
+      var durationHist = new tr.v.Histogram(
+          tr.v.Unit.byName.timeDurationInMs_smallerIsBetter);
       durationHist.add(durationInMs);
       values.addValue(new tr.v.NumericValue('total_time_' + title, durationHist,
           {description: 'Time spent in RAIL stage ' + title}));
 
-      var energyHist = ENERGY_NUMERIC_BUILDER.build();
+      var energyHist = new tr.v.Histogram(
+          tr.v.Unit.byName.energyInJoules_smallerIsBetter);
       energyHist.add(energyInJ);
       values.addValue(new tr.v.NumericValue('total_energy_' + title, energyHist,
           {description: 'Energy consumed in RAIL stage ' + title}));
 
-      var powerHist = POWER_NUMERIC_BUILDER.build();
+      var powerHist = new tr.v.Histogram(
+          tr.v.Unit.byName.powerInWatts_smallerIsBetter);
       powerHist.add(powerInW);
       values.addValue(new tr.v.NumericValue('energy_consumption_rate_' + title,
-          powerHist,
-          {description: 'Energy consumption rate for RAIL stage ' + title}));
+          powerHist, {description: 'Energy consumption rate for RAIL stage ' +
+            title}));
     }
   }