specified in https://github.com/w3c/webrtc-stats/pull/762 and take FlexFEC into account for receive statistics. BUG=webrtc:15250 Change-Id: Id85775ab1f29487d5b8bf478da6e22071005901a Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/294881 Reviewed-by: Harald Alvestrand <hta@webrtc.org> Reviewed-by: Danil Chapovalov <danilchap@webrtc.org> Reviewed-by: Henrik Boström <hbos@webrtc.org> Commit-Queue: Philipp Hancke <phancke@microsoft.com> Cr-Commit-Position: refs/heads/main@{#40325}