[Telemetry] Fix interaction record label warnings

telemetry/telemetry/web_perf/metrics/smoothness.py

Index: telemetry/telemetry/web_perf/metrics/smoothness.py
diff --git a/telemetry/telemetry/web_perf/metrics/smoothness.py b/telemetry/telemetry/web_perf/metrics/smoothness.py
index fee30ff8734cd5a2b2dd2d804cb4df43c0828422..b501dd31795d7f02c3c97769d43ab54d4a1602a6 100644
--- a/telemetry/telemetry/web_perf/metrics/smoothness.py
+++ b/telemetry/telemetry/web_perf/metrics/smoothness.py
@@ -55,10 +55,11 @@ class SmoothnessMetric(timeline_based_metric.TimelineBasedMetric):
       renderer_process, model.browser_process, model.surface_flinger_process,
       [r.GetBounds() for r in interaction_records])
     has_surface_flinger_stats = model.surface_flinger_process is not None
-    self._PopulateResultsFromStats(results, stats, has_surface_flinger_stats)
+    self._PopulateResultsFromStats(results, stats, has_surface_flinger_stats,
+                                   interaction_records[0].label)
 
-  def _PopulateResultsFromStats(self, results, stats,
-                                has_surface_flinger_stats):
+  def _PopulateResultsFromStats(
+      self, results, stats, has_surface_flinger_stats, tir_label):
     page = results.current_page
     values = [
         self._ComputeQueueingDuration(page, stats),
@@ -77,6 +78,7 @@ class SmoothnessMetric(timeline_based_metric.TimelineBasedMetric):
       values += self._ComputeSurfaceFlingerMetric(page, stats)
 
     for v in values:
+      v.tir_label = tir_label
       results.AddValue(v)
 
   def _HasEnoughFrames(self, list_of_frame_timestamp_lists):