Performance measures of old and new RTCPeerConnection.getStats added.

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 d232889106d41036fd8bd191f11b1aa6336317b1..ec65ba1a3b3e3a5b16fdf1937b6d9ec08c02fa95 100644
--- a/chrome/browser/media/webrtc/webrtc_browsertest_base.cc
+++ b/chrome/browser/media/webrtc/webrtc_browsertest_base.cc
@@ -497,6 +497,11 @@ std::vector<std::string> WebRtcTestBase::VerifyStatsGeneratedPromise(
   return JsonArrayToVectorOfStrings(result.substr(3));
 }
 
+void WebRtcTestBase::GetStatsCallbackAndReturn(
+    content::WebContents* tab) const {
+  EXPECT_EQ(ExecuteJavascript("getStatsCallbackAndReturn()", tab), "done");
+}
+
 scoped_refptr<content::TestStatsReportDictionary>
 WebRtcTestBase::GetStatsReportDictionary(content::WebContents* tab) const {
   std::string result = ExecuteJavascript("getStatsReportDictionary()", tab);
@@ -512,6 +517,10 @@ WebRtcTestBase::GetStatsReportDictionary(content::WebContents* tab) const {
           std::unique_ptr<base::DictionaryValue>(dictionary)));
 }
 
+void WebRtcTestBase::GetStatsAndReturn(content::WebContents* tab) const {
+  EXPECT_EQ(ExecuteJavascript("getStatsAndReturn()", tab), "done");
+}
+
 std::vector<std::string> WebRtcTestBase::GetWhitelistedStatsTypes(
     content::WebContents* tab) const {
   return JsonArrayToVectorOfStrings(