Experiment for the nack module.

webrtc/modules/rtp_rtcp/source/rtp_rtcp_impl.cc

Index: webrtc/modules/rtp_rtcp/source/rtp_rtcp_impl.cc
diff --git a/webrtc/modules/rtp_rtcp/source/rtp_rtcp_impl.cc b/webrtc/modules/rtp_rtcp/source/rtp_rtcp_impl.cc
index b966c00fb5510b3f0836c489e80a9b048779baf1..7aecdcba538dd7a2ba50a5fc82fdf69b455cf3eb 100644
--- a/webrtc/modules/rtp_rtcp/source/rtp_rtcp_impl.cc
+++ b/webrtc/modules/rtp_rtcp/source/rtp_rtcp_impl.cc
@@ -741,8 +741,14 @@ int32_t ModuleRtpRtcpImpl::SendNACK(const uint16_t* nack_list,
   }
   nack_last_seq_number_sent_ = nack_list[start_id + nack_length - 1];
 
-  return rtcp_sender_.SendRTCP(
-      GetFeedbackState(), kRtcpNack, nack_length, &nack_list[start_id]);
+  return rtcp_sender_.SendRTCP(GetFeedbackState(), kRtcpNack, nack_length,
+                               &nack_list[start_id]);
+}
+
+void ModuleRtpRtcpImpl::SendNack(
+    const std::vector<uint16_t>& sequence_numbers) {
+  rtcp_sender_.SendRTCP(GetFeedbackState(), kRtcpNack, sequence_numbers.size(),
+                        sequence_numbers.data());
 }
 
 bool ModuleRtpRtcpImpl::TimeToSendFullNackList(int64_t now) const {