Propagate new device policies for enterprise auto-update controls.

Enterprise admins needs more control over Chrome OS auto-update behavior.
This CL propagates the newly added fields in the chrome_device_proto
so that update_engine can consume it.

BUG=27307: Implement StopAutoUpdate based on enterprise policy
TEST=ChromeOS updateengine works.
CQ-DEPEND=I873981e171b5e40ae0e16ba954042e228b5d23be
Change-Id: I61a498280c3ccca674e74581f1b03364d7896bc2
Reviewed-on: https://gerrit.chromium.org/gerrit/18398
Reviewed-by: Jay Srinivasan <jaysri@chromium.org>
Tested-by: Jay Srinivasan <jaysri@chromium.org>
Commit-Ready: Jay Srinivasan <jaysri@chromium.org>
4 files changed