Log WebRTC.Video.AVSyncOffsetInMs.
Log WebRTC.Video.AVSyncOffsetInMs.

BUG=
R=asapersson@webrtc.org

Review-Url: https://codereview.webrtc.org/1941993002
Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#12605}

ShiftMediaProject/libilbc,TimothyGu/libilbc,TimothyGu/libilbc,ShiftMediaProject/libilbc,ShiftMediaProject/libilbc,TimothyGu/libilbc,TimothyGu/libilbc,ShiftMediaProject/libilbc,ShiftMediaProject/libilbc,TimothyGu/libilbc