Password bouncer - Fix IME with no view

It is not required for an IME to have a visible view. In this case,
provide a default animation to reveal the textview. If an incoming
call starts to animate for the IME, cancel the default animation and
proceed from where it left off.

Fixes: 180298552
Test: manual
Change-Id: I65bfc14554652e4f05971c2b280efa6490a72504