Before this CL, timestamps of received packets were rounded to the nearest millisecond and stored as int64_t. Due to the rounding it sometimes happened that timestamps later in the pipeline that are not rounded seem to occur even before the video frame was received. Change-Id: I92d8f3540b23baae2d4a1dc6a7cb3f58bcdaad18 Bug: webrtc:12722 Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/216398 Reviewed-by: Chen Xing <chxg@google.com> Reviewed-by: Harald Alvestrand <hta@webrtc.org> Commit-Queue: Johannes Kron <kron@webrtc.org> Cr-Commit-Position: refs/heads/master@{#33916}