To allow to calculate send delay with that callback Bug: None Change-Id: I0fe1ffd42b62c99bd01670e583584511c34277db Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/319563 Reviewed-by: Åsa Persson <asapersson@webrtc.org> Commit-Queue: Danil Chapovalov <danilchap@webrtc.org> Cr-Commit-Position: refs/heads/main@{#40731}