Add a flag to cancelDragAndDrop to skip animation

When running cancel animation for drag shadow image, the system cannot
start another drag operation, which is problematic when the system would
start the other drag operation quickly.

Bug: 130313958
Test: Cancel drag operation by calling cancelDragAndDrop
Change-Id: I5d6650a0ce9a4cd80bbdb1beabc9e514349ccadc
6 files changed