Expose the desktop location of an unconsumed drag and drop

When dispatching DragEvent for ACTION_DRAG_ENDED action
getX and getY will return the location of the drop if it was not
consumed by any app.

Consumed drops will return (0,0) location as before.

Bug: 25486808
Change-Id: Ic57d94b42de62d8327e9ce47d92ba335c21b8ae2
2 files changed