As an alternative to attaching custom array of bytes. Bug: b/178094662 Change-Id: I92dcbf04998d8206091125febc520ebfcc4bcebf Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/203264 Reviewed-by: Christoffer Rodbro <crodbro@webrtc.org> Reviewed-by: Harald Alvestrand <hta@webrtc.org> Reviewed-by: Emil Lundmark <lndmrk@webrtc.org> Commit-Queue: Danil Chapovalov <danilchap@webrtc.org> Cr-Commit-Position: refs/heads/master@{#33069}