GitLab

It means Swarming will use ACLs defined in realms.cfg when
authorizing Buildbucket calls (this will eventually be default).

Enable realms-aware mode on 100% on cr-buildbucket-dev builds.

R=gbeaty@chromium.org
BUG=1136313

Change-Id: I3c4a6fd4d85c64310f30223abeeb199ef97af1fe
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2466488Reviewed-by: Garrett Beaty <gbeaty@chromium.org>
Commit-Queue: Vadim Shtayura <vadimsh@chromium.org>
Cr-Commit-Position: refs/heads/master@{#816356}