tree 7d8f06abcfffbbb8e5793cb186e6551b74a404a0
parent 3f0a53fa448fc077a1e3ca547bdd0f3bd408372f
author Tony Wickham <twickham@google.com> 1476826981 -0700
committer Tony Wickham <twickham@google.com> 1476827162 -0700

Mark cells as unoccupied in onDragStart instead of startDrag.

Also move cleanup (resetting variables to null) to onDragEnd
instead of onDropCompleted. These changes are necessary because
pre-drags (for apps with shortcuts) don't call onDragStart
or onDropCompleted.

Bug: 32246571
Change-Id: Ib18fac64555e9158b776f9c12afc2cb807b3c355