Set timestamp of cloud policy in Enterprise reporting extension API.

Set the timestamp of last fetch time of MachineLevelUserCloudPolicy
if it's enabled.

Bug: 832907
Change-Id: I80084e82932479b7e2ee29474f069c685d96f063
Reviewed-on: https://chromium-review.googlesource.com/1013044
Reviewed-by: Julian Pastarmov <pastarmovj@chromium.org>
Reviewed-by: Marc-André Decoste <mad@chromium.org>
Commit-Queue: Owen Min <zmin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#550993}
3 files changed