dbus: login_manager: Add ARC method GetArcStartTime

BUG=b:27344520
TEST=None

Change-Id: I382e0e2c69007886994ba00e8af526fac2337d23
Signed-off-by: Chung-yih Wang <cywang@google.com>
Reviewed-on: https://chromium-review.googlesource.com/335690
Reviewed-by: Dan Erat <derat@chromium.org>
1 file changed