Add support for FEC-FR semantics in StreamParams.

webrtc/media/base/testutils.cc

 /*
  *  Copyright (c) 2004 The WebRTC project authors. All Rights Reserved.
  *
  *  Use of this source code is governed by a BSD-style license
  *  that can be found in the LICENSE file in the root of the source
  *  tree. An additional intellectual property rights grant can be found
  *  in the file PATENTS.  All contributing project authors may
  *  be found in the AUTHORS file in the root of the source tree.
  */
 
@@ skipping 250 matching lines @@
     sp.ssrcs.push_back(rtx_ssrcs[i]);
     std::vector<uint32_t> fid_ssrcs;
     fid_ssrcs.push_back(ssrcs[i]);
     fid_ssrcs.push_back(rtx_ssrcs[i]);
     cricket::SsrcGroup fid_group(cricket::kFidSsrcGroupSemantics, fid_ssrcs);
     sp.ssrc_groups.push_back(fid_group);
   }
   return sp;
 }
 
+cricket::StreamParams CreatePrimaryWithFecFrStreamParams(
+    const std::string& cname,
+    uint32_t primary_ssrc,
+    uint32_t flexfec_ssrc) {
+  cricket::StreamParams sp;
+  cricket::SsrcGroup sg(cricket::kFecFrSsrcGroupSemantics,
+                        {primary_ssrc, flexfec_ssrc});
+  sp.ssrcs = {primary_ssrc};
+  sp.ssrc_groups.push_back(sg);
+  sp.cname = cname;
+  return sp;
+}
+
 }  // namespace cricket