Add support for FEC-FR semantics in StreamParams.

webrtc/media/base/testutils.h

Index: webrtc/media/base/testutils.h
diff --git a/webrtc/media/base/testutils.h b/webrtc/media/base/testutils.h
index 01a2a4f9c175d1a3456b36696242ad4779a040ea..966a25be97f5bd62779e6da1dcdb0d404e9c110b 100644
--- a/webrtc/media/base/testutils.h
+++ b/webrtc/media/base/testutils.h
@@ -192,6 +192,12 @@ cricket::StreamParams CreateSimWithRtxStreamParams(
     const std::vector<uint32_t>& ssrcs,
     const std::vector<uint32_t>& rtx_ssrcs);
 
+// Create StreamParams with single primary SSRC and corresponding FlexFEC SSRC.
+cricket::StreamParams CreatePrimaryWithFecFrStreamParams(
+    const std::string& cname,
+    uint32_t primary_ssrc,
+    uint32_t flexfec_ssrc);
+
 }  // namespace cricket
 
 #endif  // WEBRTC_MEDIA_BASE_TESTUTILS_H_