Spec: https://w3c.github.io/webrtc-stats/#remoteinboundrtpstats-dict* Adding them into the stats definition as well. Bug: webrtc:12507 Change-Id: Id467a33fe7bb256655b68819e3ce87ca9af5b25f Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/209000 Reviewed-by: Henrik Boström <hbos@webrtc.org> Commit-Queue: Henrik Boström <hbos@webrtc.org> Cr-Commit-Position: refs/heads/master@{#33363}