Implement alternative ViewGroup.getChildVisibleRect.

This CL allows getChildVisibleRect to optionally always call the
view's parent. The previous version attempted to optimize the call
by not calling further up the view heirarchy when the rect isn't
visible in the current view.

The call is hidden and the previous behaviour is preserved to limit
the bits of code that this change affects.

Bug: 28514727
Change-Id: I49550ed4082bcbdcfe4643b962b50f3308092525