Niels has been doing a lot of work in call and are aware of many of the
design considerations relevant for the sub folder.
Bug: None
Change-Id: I0b269fa831eaa832f108791423252154158815be
Reviewed-on: https://webrtc-review.googlesource.com/55300
Reviewed-by: Stefan Holmer <stefan@webrtc.org>
Commit-Queue: Sebastian Jansson <srte@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#22092}