We built this method so that the window would have
something to fade out on top of. But with longer icon loading times,
this causes a buggy experience since the window is opaque
for the entire duration of the animation.
Having the window always fade out is a better UX for now.
Next step is to always init the FloatingIconView with the
in-memory icon, and then possibly caching both layers
of AdaptiveIcon.
Test: restart phone, swipe up to home
restart phone, back swipe to home (This flow never called keepWindowOpaque)
Bug: 207389002
Change-Id: Ida64829c60881786ed91e8641cdf7a278b37e201
Jon Miranda
5040335e35