- Added local and remote RTP statistics query API. - Change includes simplifying remote SSRC change handling via received RTP and RTCP packets. Bug: webrtc:11989 Change-Id: Ia3ee62c1191baaedc67e033ea3c661d8c9301abc Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/199060 Reviewed-by: Harald Alvestrand <hta@webrtc.org> Reviewed-by: Mirko Bonadei <mbonadei@webrtc.org> Reviewed-by: Sam Zackrisson <saza@webrtc.org> Commit-Queue: Tim Na <natim@webrtc.org> Cr-Commit-Position: refs/heads/master@{#32954}