It was introduced, together with the PacketLossStats class, in cl https://codereview.webrtc.org/1198853004 (#9568). It is unused in webrtc, but there's downstream usage of the PacketLossStats class, which should perhaps be moved or deleted in a later cl. Bug: None Change-Id: I17a3d5c8748f2cc9809c438630cbe8ab680466c4 Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/140042 Commit-Queue: Niels Moller <nisse@webrtc.org> Reviewed-by: Danil Chapovalov <danilchap@webrtc.org> Cr-Commit-Position: refs/heads/master@{#28153}