Telemetry Test for WebRTC Rendering.

tools/telemetry/telemetry/web_perf/timeline_based_measurement.py

Index: tools/telemetry/telemetry/web_perf/timeline_based_measurement.py
diff --git a/tools/telemetry/telemetry/web_perf/timeline_based_measurement.py b/tools/telemetry/telemetry/web_perf/timeline_based_measurement.py
index 8644988a9e07f87d64e37d5ec692d00ee2173674..5be3dea4e17efc8fb923366b32ad081c10170441 100644
--- a/tools/telemetry/telemetry/web_perf/timeline_based_measurement.py
+++ b/tools/telemetry/telemetry/web_perf/timeline_based_measurement.py
@@ -11,6 +11,7 @@ from telemetry.timeline import tracing_options
 from telemetry.value import trace
 from telemetry.web_perf.metrics import timeline_based_metric
 from telemetry.web_perf.metrics import blob_timeline
+from telemetry.web_perf.metrics import webrtc_rendering_timeline
 from telemetry.web_perf.metrics import gpu_timeline
 from telemetry.web_perf.metrics import indexeddb_timeline
 from telemetry.web_perf.metrics import layout
@@ -48,7 +49,8 @@ def _GetAllTimelineBasedMetrics():
           blob_timeline.BlobTimelineMetric(),
           memory_timeline.MemoryTimelineMetric(),
           text_selection.TextSelectionMetric(),
-          indexeddb_timeline.IndexedDBTimelineMetric())
+          indexeddb_timeline.IndexedDBTimelineMetric(),
+          webrtc_rendering_timeline.WebRtcRenderingTimelineMetric())
 
 
 class InvalidInteractions(Exception):
@@ -253,7 +255,6 @@ class TimelineBasedMeasurement(story_test.StoryTest):
     """Configure and start tracing."""
     if not platform.tracing_controller.IsChromeTracingSupported():
       raise Exception('Not supported')
-
     platform.tracing_controller.Start(self._tbm_options.tracing_options,
                                       self._tbm_options.category_filter)