Let FlexfecReceiveStreamImpl send RTCP RRs.

webrtc/modules/rtp_rtcp/source/flexfec_receiver.cc

 /*
  *  Copyright (c) 2016 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 27 matching lines @@
       recovered_packet_receiver_(recovered_packet_receiver),
       clock_(Clock::GetRealTimeClock()),
       last_recovered_packet_ms_(-1) {
   // It's OK to create this object on a different thread/task queue than
   // the one used during main operation.
   sequence_checker_.Detach();
 }
 
 FlexfecReceiver::~FlexfecReceiver() = default;
 
-bool FlexfecReceiver::AddAndProcessReceivedPacket(RtpPacketReceived packet) {
+bool FlexfecReceiver::AddAndProcessReceivedPacket(
+    const RtpPacketReceived& packet) {
   RTC_DCHECK_CALLED_SEQUENTIALLY(&sequence_checker_);
   if (!AddReceivedPacket(std::move(packet))) {
     return false;
   }
   return ProcessReceivedPackets();
 }
 
 FecPacketCounter FlexfecReceiver::GetPacketCounter() const {
   RTC_DCHECK_CALLED_SEQUENTIALLY(&sequence_checker_);
   return packet_counter_;
 }
 
-bool FlexfecReceiver::AddReceivedPacket(RtpPacketReceived packet) {
+bool FlexfecReceiver::AddReceivedPacket(const RtpPacketReceived& packet) {
   RTC_DCHECK_CALLED_SEQUENTIALLY(&sequence_checker_);
 
   // RTP packets with a full base header (12 bytes), but without payload,
   // could conceivably be useful in the decoding. Therefore we check
   // with a non-strict inequality here.
   RTC_DCHECK_GE(packet.size(), kRtpHeaderSize);
 
   // Demultiplex based on SSRC, and insert into erasure code decoder.
   std::unique_ptr<ReceivedPacket> received_packet(new ReceivedPacket());
   received_packet->seq_num = packet.SequenceNumber();
@@ skipping 72 matching lines @@
           ForwardErrorCorrection::ParseSsrc(recovered_packet->pkt->data);
       LOG(LS_VERBOSE) << "Recovered media packet with SSRC: " << media_ssrc
                       << " from FlexFEC stream with SSRC: " << ssrc_ << ".";
       last_recovered_packet_ms_ = now_ms;
     }
   }
   return true;
 }
 
 }  // namespace webrtc