Re-enable the multiple_peerconnections story and disable webrtc traces and metrics.

tools/perf/page_sets/webrtc_cases.py

 # 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.
 
 from telemetry import story
 from telemetry.page import page as page_module
 
 
 class WebrtcPage(page_module.Page):
 
@@ skipping 114 matching lines @@
         cloud_storage_bucket=story.PUBLIC_BUCKET)
 
     self.AddStory(GetUserMedia(self, tags=['getusermedia']))
     self.AddStory(MultiplePeerConnections(self, tags=['stress']))
     self.AddStory(VideoCall(self, tags=['peerconnection', 'smoothness']))
     self.AddStory(DataChannel(self, tags=['datachannel']))
     self.AddStory(CanvasCapturePeerConnection(self, tags=['smoothness']))
     # TODO(qyearsley, mcasas): Add webrtc.audio when http://crbug.com/468732
     # is fixed, or revert https://codereview.chromium.org/1544573002/ when
     # http://crbug.com/568333 is fixed.
     # self.AddStory(AudioCall(self, 'OPUS'))

[nednguyen, 2017/05/26 18:40:21]

These disabling seem should be converted to the SetExpectations below as well.

     # self.AddStory(AudioCall(self, 'G772'))
     # self.AddStory(AudioCall(self, 'PCMU'))
     # self.AddStory(AudioCall(self, 'ISAC/1600'))
 
 
 class WebrtcExpectations(story.expectations.StoryExpectations):
   def SetExpectations(self):
-    self.DisableStory('multiple_peerconnections', [story.expectations.ALL],
-                      'crbug.com/725502')
+    pass

[nednguyen, 2017/05/26 18:30:52]

this is wrong since it gonna return None. Randy: what should we do here?

[rnephew (Reviews Here), 2017/05/26 18:51:51]

Its fine. This is the default for this method:
https://cs.chromium.org/chromium/src/third_party/catapult/telemetry/telemetry...

Here is where SetExpecation is used:
https://cs.chromium.org/chromium/src/third_party/catapult/telemetry/telemetry...

I think you have this confused with GetExpectations which is in benchmark.py:
https://cs.chromium.org/chromium/src/third_party/catapult/telemetry/telemetry...