base

More fun with AbsListView smooth scrolling

If any data set change is pending when a smooth scroll is requested,
post it for later - not just if the list is currently empty.

Fix a bug in relative smooth scrolling where the last view was being
determined incorrectly.

Bug 6434713

Change-Id: Ic249eefc594151a414a6a8758074a9a60888e2b4