Protected streams report RTP messages directly to the FlexFec streams

webrtc/modules/rtp_rtcp/source/flexfec_receiver.cc

Index: webrtc/modules/rtp_rtcp/source/flexfec_receiver.cc
diff --git a/webrtc/modules/rtp_rtcp/source/flexfec_receiver.cc b/webrtc/modules/rtp_rtcp/source/flexfec_receiver.cc
index 13899d5e5feec54a1f9d2b95a606a452d736d184..6b5a5c7fc3c0a16d31e1275d0704755d444f2d30 100644
--- a/webrtc/modules/rtp_rtcp/source/flexfec_receiver.cc
+++ b/webrtc/modules/rtp_rtcp/source/flexfec_receiver.cc
@@ -59,6 +59,8 @@ FecPacketCounter FlexfecReceiver::GetPacketCounter() const {
   return packet_counter_;
 }
 
+// TODO(eladalon): Consider using packet.recovered() to avoid processing
+// recovered packets here.
 bool FlexfecReceiver::AddReceivedPacket(const RtpPacketReceived& packet) {
   RTC_DCHECK_CALLED_SEQUENTIALLY(&sequence_checker_);
 
@@ -93,6 +95,11 @@ bool FlexfecReceiver::AddReceivedPacket(const RtpPacketReceived& packet) {
     if (received_packet->ssrc != protected_media_ssrc_) {
       return false;
     }
+    // TODO(eladalon): It seems like, because of return-statement above,
+    // it could be that nobody ever ends up updating |is_fec|. Specifically,
+    // it seems like a media packet would never be set to |is_fec=false|
+    // if there is no FlexFEC stream protecting it.
+    // https://bugs.chromium.org/p/webrtc/issues/detail?id=7954
     received_packet->is_fec = false;
 
     // Insert entire packet into erasure code.