also refactor the code to have FillSendCodecStats/FillReceiveCodecStats
methods for similarity with the video engine code.
BUG=webrtc:14808
Change-Id: Ib0687f36a4b4a71c849e0b4918e50592d7772ff8
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/290891
Reviewed-by: Jakob Ivarsson <jakobi@webrtc.org>
Reviewed-by: Ilya Nikolaevskiy <ilnik@webrtc.org>
Commit-Queue: Philipp Hancke <phancke@microsoft.com>
Cr-Commit-Position: refs/heads/main@{#39172}
9ad10bc492