Rename RtpVideoSender::SetActiveModules to SetSending to better match
what it does. When a RtpVideoSender::SetSending(true) RTP packets can be
sent on all associcated RTP streams (simulcast streams).
Move registration of RtpRtcpModules to RtpTransportControllerSend to
allow RtpTransportControllerSend to know when there are sending RTP
streams. Purpose is to in later CLs allow RtpTransportControllerSend to
trigger BWE probes.
Bug: webrtc:14928
Change-Id: Ibf6c040b86713cdc4763c4691b7fd794b251eb49
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/335961
Reviewed-by: Erik Språng <sprang@webrtc.org>
Commit-Queue: Per Kjellander <perkj@webrtc.org>
Cr-Commit-Position: refs/heads/main@{#41620}
979b6d62a8