Count FlexFEC packets in |fec_bitrate_| in RTPSenderVideo.

webrtc/modules/rtp_rtcp/source/rtp_sender_video.cc

Index: webrtc/modules/rtp_rtcp/source/rtp_sender_video.cc
diff --git a/webrtc/modules/rtp_rtcp/source/rtp_sender_video.cc b/webrtc/modules/rtp_rtcp/source/rtp_sender_video.cc
index 7fcc6578fba356fa35964f613548bf8a9db720bd..849ed78eadc07a94ad988683cef58c330701f89c 100644
--- a/webrtc/modules/rtp_rtcp/source/rtp_sender_video.cc
+++ b/webrtc/modules/rtp_rtcp/source/rtp_sender_video.cc
@@ -198,11 +198,13 @@ void RTPSenderVideo::SendVideoPacketWithFlexfec(
     std::vector<std::unique_ptr<RtpPacketToSend>> fec_packets =
         flexfec_sender_->GetFecPackets();
     for (auto& fec_packet : fec_packets) {
+      size_t packet_length = fec_packet->size();
       uint32_t timestamp = fec_packet->Timestamp();
       uint16_t seq_num = fec_packet->SequenceNumber();
       if (rtp_sender_->SendToNetwork(std::move(fec_packet), kDontRetransmit,
                                      RtpPacketSender::kLowPriority)) {
-        // TODO(brandtr): Wire up stats here.
+        rtc::CritScope cs(&stats_crit_);
+        fec_bitrate_.Update(packet_length, clock_->TimeInMilliseconds());
         TRACE_EVENT_INSTANT2(TRACE_DISABLED_BY_DEFAULT("webrtc_rtp"),
                              "Video::PacketFlexfec", "timestamp", timestamp,
                              "seqnum", seq_num);