onChildAttachedToWindow is called before the layout manager is finished
processing the layout, so incorrect measurements / intermediate
animation states can be present.
onLayoutCompleted occurs after each full layout calculation, including
measuring multiple views or animating, and is a better signal to use.
Fix: 190391539
Test: verified locally with search use case and other expand collapse
cases
Change-Id: If01caf33c6c3371636895e1361d80de536363239
Stevie Kideckel
2dab912b95