Fix incorrect values for VelocityTracker in SwipeDismissLayout.

The offset used to adjust MotionEvents for swipe velocity tracking
was incorrect, and caused issues when touch points where close
together. Fixed the offset used, which resolved swiping issues.

Bug: 34673753
Change-Id: Ide6060b511510bcf299e3db778e6ffc6afda5e19
1 file changed