This tests host event and hook are triggered when AC status changes.
BUG=chrome-os-partner:19236
TEST=Pass the test.
BRANCH=None
Change-Id: I9e4263f3f6e273bfb0b24671a4e5c56b20a04e1a
Signed-off-by: Vic Yang <victoryang@chromium.org>
Reviewed-on: https://gerrit.chromium.org/gerrit/61554
Reviewed-by: Randall Spangler <rspangler@chromium.org>
