[telemetry] Add Html2OutputFormatter for generating results2.html

tracing/tracing/metrics/system_health/responsiveness_metric.html

Index: tracing/tracing/metrics/system_health/responsiveness_metric.html
diff --git a/tracing/tracing/metrics/system_health/responsiveness_metric.html b/tracing/tracing/metrics/system_health/responsiveness_metric.html
index bfeb315f90650487c2fd15a33ec5b0cdc1054579..63c106b5eca3250c43263175b2d7173e89de4f1a 100644
--- a/tracing/tracing/metrics/system_health/responsiveness_metric.html
+++ b/tracing/tracing/metrics/system_health/responsiveness_metric.html
@@ -70,7 +70,8 @@ tr.exportTo('tr.metrics.sh', function() {
       tr.b.Range.fromExplicitRange(0, 300), 60);
 
   function responsivenessMetric(values, model) {
-    tr.metrics.sh.firstPaintMetric(values, model);
+    // TODO(benjhayden): Add categories to benchmark to support:
+    // tr.metrics.sh.firstPaintMetric(values, model);
 
     var responseNumeric = RESPONSE_NUMERIC_BUILDER.build();
     var throughputNumeric = THROUGHPUT_NUMERIC_BUILDER.build();