Knows about GCE Provider protos and some new fields in CQ protos. No API
changes.

R=tandrii@chromium.org

Change-Id: I23e131423884d6ac785810a24526c0a89e32c328
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/tools/depot_tools/+/1586375Reviewed-by: Robbie Iannucci <iannucci@chromium.org>
Reviewed-by: Andrii Shyshkalov <tandrii@chromium.org>
Commit-Queue: Vadim Shtayura <vadimsh@chromium.org>