This prepares for running it in simulated time.
TBR=henrika@webrtc.org
Bug: webrtc:10465
Change-Id: I9b29b8af9aeba7f0c8209ca77294a63d8068ff1a
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/126481
Reviewed-by: Sebastian Jansson <srte@webrtc.org>
Reviewed-by: Oskar Sundbom <ossu@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#27083}