Tommi 3f418ccf99 Add documentation+DCHECK for the packet path from transport to call.
An upcoming change will remove PeerConnection's involvement in
the RTCP packet path and keep the flow consistent with the RTP packet
path.

Bug: webrtc:11993
Change-Id: I7ce1bbe8bbc352a49310e2e55b55ca5d8d927935
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/217389
Reviewed-by: Harald Alvestrand <hta@webrtc.org>
Commit-Queue: Tommi <tommi@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#33927}
2021-05-05 14:13:03 +00:00
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