RTCRtpSender with track behind RuntimeEnabled flag

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 <limits>
 
@@ skipping 550 matching lines @@
 }
 
 void WebRtcTestBase::CreateAndAddStreams(content::WebContents* tab,
                                          size_t count) const {
   EXPECT_EQ(
       "ok-streams-created-and-added",
       ExecuteJavascript(
           "createAndAddStreams(" + base::SizeTToString(count) + ")", tab));
 }
 
+void WebRtcTestBase::VerifyRtpSenders(
+    content::WebContents* tab,
+    base::Optional<size_t> expected_num_tracks) const {
+  std::string javascript =
+      expected_num_tracks ? "verifyRtpSenders(" +
+                                base::SizeTToString(*expected_num_tracks) + ")"
+                          : "verifyRtpSenders()";
+  EXPECT_EQ("ok-senders-verified", ExecuteJavascript(javascript, tab));
+}
+
 void WebRtcTestBase::VerifyRtpReceivers(
     content::WebContents* tab,
     base::Optional<size_t> expected_num_tracks) const {
   std::string javascript =
       expected_num_tracks ? "verifyRtpReceivers(" +
                                 base::SizeTToString(*expected_num_tracks) + ")"
                           : "verifyRtpReceivers()";
   EXPECT_EQ("ok-receivers-verified", ExecuteJavascript(javascript, tab));
 }