This collects this metric for both audio and video streams. https://w3c.github.io/webrtc-stats/#dom-rtcinboundrtpstreamstats-lastpacketreceivedtimestamp This is a follow-up to https://webrtc-review.googlesource.com/c/src/+/130479 which calculated this metric. This CL is purely plumbing from "StreamDataCounters::last_packet_received_timestamp_ms" to RTCInboundRtpStreamStats. Bug: webrtc:10449 Change-Id: I757ad19b5b8e84553da5edd4a75efa3e1fe30b56 Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/131397 Commit-Queue: Henrik Boström <hbos@webrtc.org> Reviewed-by: Åsa Persson <asapersson@webrtc.org> Reviewed-by: Fredrik Solenberg <solenberg@webrtc.org> Cr-Commit-Position: refs/heads/master@{#27628}