The mock power button GPIO is initially low, so we need to set it high
before testing it. Also, wait for all tasks to start before starting the
test to prevent race condition.
BUG=chrome-os-partner:19236
TEST=Pass the test
BRANCH=None
Change-Id: I813588a9c721815c1213882f7a9458daea4d78eb
Signed-off-by: Vic (Chun-Ju) Yang <victoryang@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/181744
Reviewed-by: Vincent Palatin <vpalatin@chromium.org>
Reviewed-by: Randall Spangler <rspangler@chromium.org>