[telemetry] Add Html2OutputFormatter for generating results2.html

tracing/tracing/metrics/value_set.html

Index: tracing/tracing/metrics/value_set.html
diff --git a/tracing/tracing/metrics/value_set.html b/tracing/tracing/metrics/value_set.html
index 60d636146a8bae77347d802a3e336f4a21fd348d..b8fce24bb4e8b742ffb2a7d8fe5feeb7812a1f42 100644
--- a/tracing/tracing/metrics/value_set.html
+++ b/tracing/tracing/metrics/value_set.html
@@ -8,6 +8,7 @@ found in the LICENSE file.
 <link rel="import" href="/tracing/base/iteration_helpers.html">
 <link rel="import" href="/tracing/value/numeric.html">
 <link rel="import" href="/tracing/value/unit.html">
+<link rel="import" href="/tracing/value/value.html">
 
 <script>
 'use strict';
@@ -30,6 +31,14 @@ tr.exportTo('tr.metrics', function() {
       return tr.b.dictionaryValues(this.values_).map(cb, opt_this);
     },
 
+    addValueDicts: function(dicts) {
+      dicts.forEach(function(dict) {
+        var value = tr.v.Value.fromDict(dict);
+        this.addValue(value);
+        // TODO(TBMv2.1): Patch up RelatedValueSets here.
+      }, this);
+    },
+
     getValuesWithName: function(name) {
       return tr.b.dictionaryValues(this.values_).filter(function(value) {
         return value.name.indexOf(name) > -1;