GitLab

This is the initial version of the policy-tool page that is created to make
managing policies easier for admins.

Bug: 
Cq-Include-Trybots: master.tryserver.chromium.linux:closure_compilation
Change-Id: Ia58300dc786a6dabcd14721d134fb52027934739
Reviewed-on: https://chromium-review.googlesource.com/613507Reviewed-by: Julian Pastarmov <pastarmovj@chromium.org>
Reviewed-by: Tommy Li <tommycli@chromium.org>
Reviewed-by: Owen Min <zmin@chromium.org>
Reviewed-by: Georges Khalil <georgesak@chromium.org>
Commit-Queue: Anton Urusov <urusant@google.com>
Cr-Commit-Position: refs/heads/master@{#502851}