In addition, let the processing thread loop explicitly, and not use
the deprecated builtin looping in PlatformThread.
Bug: webrtc:3380
Change-Id: I5171ce3457b80f922c8284259882da63c8f146f1
Reviewed-on: https://webrtc-review.googlesource.com/96544
Commit-Queue: Niels Moller <nisse@webrtc.org>
Reviewed-by: Henrik Andreassson <henrika@webrtc.org>
Reviewed-by: Artem Titov <titovartem@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#24492}