This also adds frp warning dialogs in case the user skips lock
screen setup initially.
bug:26880444
Change-Id: I732b6a806e139fb6c1c1b334b8d1608c229f217c
Make a subclass for each enrolling screen that setup wizard uses, and
in override the corresponding get*Intent methods to always use the
setup wizard versions of the next screens.
On minor change made to the original flow is that it will now return
RESULT_OK if it is finished, as opposed to RESULT_CANCELED.
Bug: 21695577
Change-Id: Id666826e8027272ede6a5426967d66fb291670a4
