Append policy fetch timestamp to the enterprise reporting

Append last policy fetch timestamp to the Profile info. Right now we only
do it for Machine Level User Cloud Policy.

Bug: 956237
Change-Id: I94de55419a609974b05d1fdd3acb54b3a911d68a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1707550
Commit-Queue: Owen Min <zmin@chromium.org>
Reviewed-by: Julian Pastarmov <pastarmovj@chromium.org>
Cr-Commit-Position: refs/heads/master@{#678756}
5 files changed