There may be strange states where the user is already authenticated
but still on the lockscreen. The user should be able to dismiss
keyguard in that state.
Fixes: 29306222
Test: unlock phone
go back to keyguard
swipe up screen half way
touch fingerprint sensor (icon should change to unlocked)
then touch fingerprint sensor again (keyguard should be dismissed)
Test: unlock phone and go to settings -> Pixel Imprint
lock phone, unlock phone with fingerprint
touch sensor again and make sure Pixel Imprint page also responds to FP
do this test at least 10 times
Change-Id: I86acd520a06a68fab3548dd4cf6153a7833114fe
625a014006