Scale up the drag drop offsets and surface size

The surface size and thumbCenterX/Y use app's coordinate space, which
need to be scaled up on the server side.

Bug: b/239478191
Test: atest DragDropTest DragDropCompatTest
Test: am compat enable DOWNSCALED com.android.dragsource
      am compat enable DOWNSCALE_30 com.android.dragsource
Change-Id: Id36caee8aa38885a95f8d237766ac968ef6c8f85