Add CsvOutputFormatter to Telemetry.

tracing/tracing/value/merge_histograms_cmdline.html

Index: tracing/tracing/value/merge_histograms_cmdline.html
diff --git a/tracing/tracing/value/merge_histograms_cmdline.html b/tracing/tracing/value/merge_histograms_cmdline.html
index 7a9b49e24cde217e923982fcd31cf7c09220e98a..4c48c760d2feeb165f270d080aed0dfc9f3f123d 100644
--- a/tracing/tracing/value/merge_histograms_cmdline.html
+++ b/tracing/tracing/value/merge_histograms_cmdline.html
@@ -69,6 +69,7 @@ function stripInternalDiagnostics(mergedHistograms) {
 if (tr.isHeadless) {
   const histograms = new tr.v.HistogramSet();
   histograms.importDicts(JSON.parse(tr.b.getSync('file://' + sys.argv[1])));
+  histograms.resolveRelatedHistograms();
   histograms.buildGroupingsFromTags([tr.v.d.RESERVED_NAMES.STORY_TAGS]);
   const groupingKeys = sys.argv.slice(2);
   const groupings = groupingKeys.map(findGrouping);