Replace OnGlobalLayoutListener with StateListener to update predictions

Previously we were using OnGlobalLayoutListener, which is only called
when AllAppsContainerView or a child is re-laid out or visibility
changes to or from GONE. Since we no longer relayout when already
scrolled to the top, we need a better hook to check whether all apps has
changed visibility for the purpose of updating predictions.

Bug: 140823188
Change-Id: I7c4a0d94c529eb86b55729c75843c8b0bd673d8c