RTCRtpSender with track behind RuntimeEnabled flag

chrome/browser/media/webrtc/webrtc_browsertest_base.h

Index: chrome/browser/media/webrtc/webrtc_browsertest_base.h
diff --git a/chrome/browser/media/webrtc/webrtc_browsertest_base.h b/chrome/browser/media/webrtc/webrtc_browsertest_base.h
index 71e0cf6897b71e19814ff21247c2a25905ffc588..4e1b15017b6b605f4ce70d1dcb5bbbafb1a0999e 100644
--- a/chrome/browser/media/webrtc/webrtc_browsertest_base.h
+++ b/chrome/browser/media/webrtc/webrtc_browsertest_base.h
@@ -188,6 +188,9 @@ class WebRtcTestBase : public InProcessBrowserTest {
   void EnableOpusDtx(content::WebContents* tab) const;
 
   void CreateAndAddStreams(content::WebContents* tab, size_t count) const;
+  void VerifyRtpSenders(content::WebContents* tab,
+                        base::Optional<size_t> expected_num_tracks =
+                            base::Optional<size_t>()) const;
   void VerifyRtpReceivers(content::WebContents* tab,
                           base::Optional<size_t> expected_num_tracks =
                               base::Optional<size_t>()) const;