Add a new telemetry benchmark to stress-test WebRTC.

tools/perf/measurements/webrtc.py

Index: tools/perf/measurements/webrtc.py
diff --git a/tools/perf/measurements/webrtc.py b/tools/perf/measurements/webrtc.py
index 90061f8ea7e1a162c50556c3bd6cb591931affc6..9fff2ec1bee499874d3341d482f7a663e6d3c663 100644
--- a/tools/perf/measurements/webrtc.py
+++ b/tools/perf/measurements/webrtc.py
@@ -13,11 +13,12 @@ from metrics import webrtc_stats
 class WebRTC(legacy_page_test.LegacyPageTest):
   """Gathers WebRTC-related metrics on a page set."""
 
-  def __init__(self):
+  def __init__(self, use_webrtc_stats=True):
     super(WebRTC, self).__init__()
     self._cpu_metric = None
     self._media_metric = None
     self._power_metric = None
+    self._use_webrtc_stats = use_webrtc_stats
     self._webrtc_stats_metric = None
 
   def WillStartBrowser(self, platform):
@@ -25,14 +26,16 @@ class WebRTC(legacy_page_test.LegacyPageTest):
 
   def DidStartBrowser(self, browser):
     self._cpu_metric = cpu.CpuMetric(browser)
-    self._webrtc_stats_metric = webrtc_stats.WebRtcStatisticsMetric()
+    if self._use_webrtc_stats:
+      self._webrtc_stats_metric = webrtc_stats.WebRtcStatisticsMetric()
 
   def DidNavigateToPage(self, page, tab):
     self._cpu_metric.Start(page, tab)
     self._media_metric = media.MediaMetric(tab)
     self._media_metric.Start(page, tab)
     self._power_metric.Start(page, tab)
-    self._webrtc_stats_metric.Start(page, tab)
+    if self._use_webrtc_stats:
+      self._webrtc_stats_metric.Start(page, tab)
 
   def CustomizeBrowserOptions(self, options):
     options.AppendExtraBrowserArgs('--use-fake-device-for-media-stream')
@@ -53,8 +56,9 @@ class WebRTC(legacy_page_test.LegacyPageTest):
     self._power_metric.Stop(page, tab)
     self._power_metric.AddResults(tab, results)
 
-    self._webrtc_stats_metric.Stop(page, tab)
-    self._webrtc_stats_metric.AddResults(tab, results)
+    if self._use_webrtc_stats:
+      self._webrtc_stats_metric.Stop(page, tab)
+      self._webrtc_stats_metric.AddResults(tab, results)
 
   def DidRunPage(self, platform):
     del platform  # unused