This a standard stat: https://w3c.github.io/webrtc-stats/#dom-rtcinboundrtpstreamstats-lastpacketreceivedtimestamp This is collected by StreamStatisticianImpl. A follow-up CL with plumb it to the RTCStatsCollector. Bug: webrtc:10449 Change-Id: I44e7f4735f9df78704ce21198f52e66d11e63740 Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/130479 Reviewed-by: Åsa Persson <asapersson@webrtc.org> Commit-Queue: Henrik Boström <hbos@webrtc.org> Cr-Commit-Position: refs/heads/master@{#27416}