Log an error in RtpDemuxer::FindSsrcAssociations() if kMaxProcessedSsrcs exceeded

webrtc/call/rtp_demuxer.h

 /*
  *  Copyright (c) 2017 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 52 matching lines @@
   // one-to-one association with an SSRC, but that SSRC is not yet known.
   // When it becomes known, the association of the sink to the RSID is deleted
   // from this container, and moved into |sinks_|.
   std::multimap<std::string, RtpPacketSinkInterface*> rsid_sinks_;
 
   // Iterating over |rsid_sinks_| for each incoming and performing multiple
   // string comparisons is of non-trivial cost. To avoid this cost, we only
   // check RSIDs for the first packet on each incoming SSRC stream.
   // (If RSID associations are added later, we check again.)
   std::set<uint32_t> processed_ssrcs_;
+
+  // Avoid an attack that would create excessive logging.
+  bool logged_max_processed_ssrcs_exceeded_ = false;
 };
 
 }  // namespace webrtc
 
 #endif  // WEBRTC_CALL_RTP_DEMUXER_H_