Add broken screen

In the new recovery process, a user will see 'broken' screen
instead of 'remove' screen, where usb stick presence is no longer
detected. A user instead has to hit esc+refresh+power to proceed
to recovery mode.

BUG=chromium:501060
BRANCH=tot
TEST=make runtests

Change-Id: Icd511c1ca892628b96befbb0a34c2c84b881c857
Reviewed-on: https://chromium-review.googlesource.com/304404
Commit-Ready: Daisuke Nojiri <dnojiri@chromium.org>
Tested-by: Daisuke Nojiri <dnojiri@chromium.org>
Reviewed-by: Randall Spangler <rspangler@chromium.org>
6 files changed