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

chrome/browser/media/webrtc/webrtc_browsertest_base.cc

Index: chrome/browser/media/webrtc/webrtc_browsertest_base.cc
diff --git a/chrome/browser/media/webrtc/webrtc_browsertest_base.cc b/chrome/browser/media/webrtc/webrtc_browsertest_base.cc
index 9419be89db13eaeadc29fc132ff99ec2ad4400f2..ec41b87a5229ac0072d721e8985317ff4111099b 100644
--- a/chrome/browser/media/webrtc/webrtc_browsertest_base.cc
+++ b/chrome/browser/media/webrtc/webrtc_browsertest_base.cc
@@ -404,6 +404,12 @@ void WebRtcTestBase::GatherAndSendIceCandidates(
       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);