tree d9c8f21c983e1c723ce5f13667942bf05b057215
parent 0882a5198b58173044e8b4b28eb4d30b1bcfe230
author Adolfo Victoria <adokar@google.com> 1532035091 -0700
committer chrome-bot <chrome-bot@chromium.org> 1532573134 -0700

update_engine: Modify Update Time Restrictions to block downloads

This makes Update Time Restrictions policy block downloads rather than
checks. This will allow for better capturing of metrics. Furthermore,
this change makes Update Time Restrictions only apply for kiosks, per
the discussion with security and PM.
The following changes are made:
* Use UpdateCanBeApplied rather than UpdateCheckAllowed in
UpdateTimeRestrictionsPolicyImpl.
* ChromeOSPolicy::UpdateCanBeApplied now checks for forced updates.
Modify the corresponding classes to implement UpdateCanBeApplied.
* Add the auto_launched_kiosk_app_id variable from libbrillo to the
policy provider, this variable lets us know if the device is in
kiosk-mode.
* If the device is not in kiosk mode, this policy won't be used.
* Change chromeos_policy to check for policies in UpdateCanBeApplied.
* Add unit tests accounting for the new changes.

BUG=chromium:852860
TEST=cros_workon_make update_engine --test

Change-Id: Iba52fa0fd1f89cc55e5009776036f8949e01e3a0
Reviewed-on: https://chromium-review.googlesource.com/1144435
Commit-Ready: Adolfo Higueros <adokar@google.com>
Tested-by: Adolfo Higueros <adokar@google.com>
Reviewed-by: Amin Hassani <ahassani@chromium.org>