With an extra interface it will allow to add both RtpRtcp module
and RtcpTransceiver as feedback sender to PacketRouter
Though hacky, this is very similar to currently used implementation
in the RTCPSender::SendFeedbackPacket
Bug: webrtc:8239
Change-Id: I237b422ae1594dede78cb63daa4aa42b6774d6fe
Reviewed-on: https://webrtc-review.googlesource.com/32680
Commit-Queue: Danil Chapovalov <danilchap@webrtc.org>
Reviewed-by: Niels Moller <nisse@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#21274}