Append second nack list in same compound rtcp packet

webrtc/modules/rtp_rtcp/source/rtcp_receiver.cc

 /*
  *  Copyright (c) 2012 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 628 matching lines @@
                               PacketInformation* packet_information) {
   rtcp::Nack nack;
   if (!nack.Parse(rtcp_block)) {
     ++num_skipped_packets_;
     return;
   }
 
   if (receiver_only_ || main_ssrc_ != nack.media_ssrc())  // Not to us.
     return;
 
-  packet_information->nack_sequence_numbers = nack.packet_ids();
+  packet_information->nack_sequence_numbers.insert(
+      packet_information->nack_sequence_numbers.end(),
+      nack.packet_ids().begin(), nack.packet_ids().end());
   for (uint16_t packet_id : nack.packet_ids())
     nack_stats_.ReportRequest(packet_id);
 
   if (!nack.packet_ids().empty()) {
     packet_information->packet_type_flags |= kRtcpNack;
     ++packet_type_counter_.nack_packets;
     packet_type_counter_.nack_requests = nack_stats_.requests();
     packet_type_counter_.unique_nack_requests = nack_stats_.unique_requests();
   }
 }
@@ skipping 393 matching lines @@
       } else {
         candidates.push_back(it->second.tmmbr_item);
         ++it;
       }
     }
   }
   return candidates;
 }
 
 }  // namespace webrtc