This avoids copying the payload at all. Future CL will change the transport. In performance tests, memcpy was visible in the performance profiles prior to this change. Bug: webrtc:12943 Change-Id: I507a1a316165db748e73cf0d58c1be62cc76a2d2 Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/236346 Commit-Queue: Victor Boivie <boivie@webrtc.org> Reviewed-by: Florent Castelli <orphis@webrtc.org> Cr-Commit-Position: refs/heads/main@{#35428}