Will be used in a follow-up CL to initialize code-owners client.

Recipe-Nontrivial-Roll: build
Change-Id: Iefe9176320b4d1ae7715e88a8db132e815be76ba
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/tools/depot_tools/+/2717979
Commit-Queue: Edward Lesmes <ehmaldonado@chromium.org>
Reviewed-by: Gavin Mak <gavinmak@google.com>