Reland of "WebRtcBrowserTest: Include all stats in getStats."

chrome/test/data/webrtc/peerconnection.js

 /**
  * 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.
  */
 
 /**
  * The one and only peer connection in this page.
  * @private
  */
@@ skipping 82 matching lines @@
  *     video codec, e.g. the first one in the list on the 'm=video' SDP offer
  *     line. |videoCodec| is the case-sensitive codec name, e.g. 'VP8' or
  *     'H264'.
  */
 function forceVideoCodec(videoCodec) {
   gDefaultVideoCodec = videoCodec;
   returnToTest('ok-forced');
 }
 
 /**
+ * Creates a data channel with the specified label.
+ * Returns 'ok-created' to test.
+ */
+function createDataChannel(label) {
+  peerConnection_().createDataChannel(label);
+  returnToTest('ok-created');
+}
+
+/**
  * Asks this page to create a local offer.
  *
  * Returns a string on the format ok-(JSON encoded session description).
  *
  * @param {!Object} constraints Any createOffer constraints.
  */
 function createLocalOffer(constraints) {
   peerConnection_().createOffer(
       function(localOffer) {
         success('createOffer');
@@ skipping 300 matching lines @@
 function parseJson_(json) {
   // Escape since the \r\n in the SDP tend to get unescaped.
   jsonWithEscapedLineBreaks = json.replace(/\r\n/g, '\\r\\n');
   try {
     return JSON.parse(jsonWithEscapedLineBreaks);
   } catch (exception) {
     failTest('Failed to parse JSON: ' + jsonWithEscapedLineBreaks + ', got ' +
              exception);
   }
 }