Implements peer connection stats measurements in WebRTC call test.

tools/perf/page_sets/webrtc_cases.py

Index: tools/perf/page_sets/webrtc_cases.py
diff --git a/tools/perf/page_sets/webrtc_cases.py b/tools/perf/page_sets/webrtc_cases.py
index 431300f9c9706a2367b11047d03169213a55be08..3fd25a6cf9a1b7ce2679a85a376fe900ed86b998 100644
--- a/tools/perf/page_sets/webrtc_cases.py
+++ b/tools/perf/page_sets/webrtc_cases.py
@@ -1,6 +1,8 @@
 # Copyright 2014 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
+import os
+
 from telemetry.page import page as page_module
 from telemetry.page import page_set as page_set_module
 
@@ -10,6 +12,10 @@ class WebrtcCasesPage(page_module.Page):
   def __init__(self, url, page_set):
     super(WebrtcCasesPage, self).__init__(url=url, page_set=page_set)
 
+    with open(os.path.join(os.path.dirname(__file__),
+                           'webrtc_track_peerconnections.js')) as javascript:
+      self.script_to_evaluate_on_commit = javascript.read()
+
 
 class Page1(WebrtcCasesPage):