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

chrome/browser/media/webrtc/webrtc_browsertest_base.cc

 // Copyright 2013 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.
 
 #include "chrome/browser/media/webrtc/webrtc_browsertest_base.h"
 
 #include <stddef.h>
 
 #include "base/json/json_reader.h"
 #include "base/lazy_instance.h"
@@ skipping 386 matching lines @@
     content::WebContents* from_tab,
     content::WebContents* to_tab) const {
   std::string ice_candidates =
       ExecuteJavascript("getAllIceCandidates()", from_tab);
 
   EXPECT_EQ("ok-received-candidates", ExecuteJavascript(
       base::StringPrintf("receiveIceCandidates('%s')", ice_candidates.c_str()),
       to_tab));
 }
 
+void WebRtcTestBase::CreateDataChannel(content::WebContents* tab,
+                                       const std::string& label) {
+  EXPECT_EQ("ok-created",
+            ExecuteJavascript("createDataChannel('" + label + "')", tab));
+}
+
 void WebRtcTestBase::NegotiateCall(content::WebContents* from_tab,
                                    content::WebContents* to_tab) const {
   std::string local_offer = CreateLocalOffer(from_tab);
   std::string answer = CreateAnswer(local_offer, to_tab);
   ReceiveAnswer(answer, from_tab);
 
   // Send all ICE candidates (wait for gathering to finish if necessary).
   GatherAndSendIceCandidates(to_tab, from_tab);
   GatherAndSendIceCandidates(from_tab, to_tab);
 }
@@ skipping 80 matching lines @@
 void WebRtcTestBase::SetDefaultVideoCodec(
     content::WebContents* tab,
     const std::string& video_codec) const {
   EXPECT_EQ("ok-forced",
             ExecuteJavascript("forceVideoCodec('" + video_codec + "')", tab));
 }
 
 void WebRtcTestBase::EnableOpusDtx(content::WebContents* tab) const {
   EXPECT_EQ("ok-forced", ExecuteJavascript("forceOpusDtx()", tab));
 }