This doesn't yet have any effect on Angle builds/tasks,
but allows to associate Angle pools with the Realms config in
https://crrev.com/i/3802849

Change-Id: Id756c14e7e181cc1820cee735668949bf9567d0c
Bug: chromium:1204972
No-Try: true
Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/2867082
Commit-Queue: Andrii Shyshkalov <tandrii@google.com>
Reviewed-by: Jamie Madill <jmadill@chromium.org>