Windows cpu clock has low accuracy. We need to fake some load to be sure that the clock ticks. Bug: webrtc:12249 Change-Id: I6c3b2b0e51badd9b7a58391755a37f4d1c28af40 Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/201540 Commit-Queue: Andrey Logvin <landrey@webrtc.org> Reviewed-by: Artem Titov <titovartem@webrtc.org> Cr-Commit-Position: refs/heads/master@{#32961}