Create 1x1 dummy surface when zero size is specified for drag shadow

Since P, we cannot create zero size surface. For compatibility, we
create 1x1 dummy surface when the app claims zero size surface.

Bug: 72416622
Test: Invoke startDragAndDrop with zero size surface
Change-Id: Ifefd07e93389979eaa2a6fbe29abe5850fcdef34
1 file changed