Cherry-pick: aw: Always call computeScrollOffset for fling state

Cherry-pick of crrev.com/r256242

Original description:

Apparently computeScrollAndAbsorbGlow can be skipped in certain
situation and we would be stuck in fling state forever.

BUG: 13227361
Change-Id: Ib6380b1e675e6c6d252583a93db33aeddf9da73d
1 file changed