Refactor NumericBuilder to HistogramBinBoundaries.

trace_processor/experimental/mappers/task_info_map_function.html

Index: trace_processor/experimental/mappers/task_info_map_function.html
diff --git a/trace_processor/experimental/mappers/task_info_map_function.html b/trace_processor/experimental/mappers/task_info_map_function.html
index 19dc86bde71677279ecbc2306936f21c8e5fd980..1be9bf8ad2a33f8ed4c81bab1894ec3465f133b5 100644
--- a/trace_processor/experimental/mappers/task_info_map_function.html
+++ b/trace_processor/experimental/mappers/task_info_map_function.html
@@ -16,9 +16,8 @@ found in the LICENSE file.
 'use strict';
 
 tr.exportTo('pi.m', function() {
-  var DURATION_NUMERIC_BUILDER = tr.v.NumericBuilder.createLinear(
-      tr.v.Unit.byName.timeDurationInMs,
-      tr.b.Range.fromExplicitRange(0, 250), 50);
+  var DURATION_BOUNDARIES = tr.v.HistogramBinBoundaries.createLinear(
+      0, 250, 50);
 
   function taskInfoMapFunction(result, model) {
     var canonicalUrl = model.canonicalUrl;
@@ -98,7 +97,8 @@ tr.exportTo('pi.m', function() {
   function addToHistogram(dict, processName, threadName, value, url) {
     dict[processName] = dict[processName] || {};
     dict[processName][threadName] = dict[processName][threadName] ||
-        DURATION_NUMERIC_BUILDER.build();
+        new tr.v.Histogram(tr.v.Unit.byName.timeDurationInMs,
+            DURATION_BOUNDARIES);
     dict[processName][threadName].add(value, url);
   }