Plan is to replace SignalReadPacket with this new method and have clients register as listeners. rtc::ReceivedPacket is ammended with Descryption information so that receivers can know how to treat a received packet. This will replace the current "flag". Also see https://webrtc-review.googlesource.com/c/src/+/340301/3 Bug: webrtc:15368 Change-Id: I9ea1f34e8b1e923d67c2e92e36a22b3dd10dbd73 Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/340181 Reviewed-by: Jonas Oreland <jonaso@webrtc.org> Reviewed-by: Harald Alvestrand <hta@webrtc.org> Commit-Queue: Per Kjellander <perkj@webrtc.org> Cr-Commit-Position: refs/heads/main@{#41795}