Fixing dragging with mouse.

If you click at the icon with mouse, then release without moving,
the framework won't generate DRAG_LOCATION events, and we'll assume
the the drag ended at (0,0) coordinate.

Fixing by updating coords at any event that has coordinates.

Bug: 22028725
Change-Id: I1872b479035e14aa9fece1532b05194fa86a4907