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Queue with multiple heads is planned to be used in DefaultVideoQualityAnalyzer to store stream state. Stream state contains ordered sequence of frame ids that were send for this video stream. When frame is received by one receiver it should be removed from state for that receiver and kept for others. How it is used can be found in this CL: https://webrtc-review.googlesource.com/c/src/+/176411 Bug: webrtc:11631 Change-Id: Ic7fabf4d77131805a91f08a2ccfffc73c08d3e2d Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/176402 Commit-Queue: Artem Titov <titovartem@webrtc.org> Reviewed-by: Karl Wiberg <kwiberg@webrtc.org> Cr-Commit-Position: refs/heads/master@{#31444}