tree db220d6a94d76cf9012fe60ceba4d7130def3f87
parent b3ad0edc1476ae1562bb5e0b26f253b2e504285f
author Tony Wickham <twickham@google.com> 1523057084 -0700
committer Tony Wickham <twickham@google.com> 1523315061 -0700

Can now swipe away to dismiss second task

Previously we only allowed dragging the forefront task. Now you can
swipe up to dismiss the second task as well, but can't drag it down to
launch.

Also cleaned up page-scroll-while-dismissing logic to ensure it works
correctly in RTL and for new cases with dismissing adjacent pages.

Bug: 73187449
Change-Id: I1fe873c4cf1380b951dd3b2e396ab401ca1f7470