Bug 5699 Add ResourceTransfer to packages view
The packages view should add the ResoruceTransfer as a drag source to its list of transfers
org.eclipse.jdt.ui/ui/org/eclipse/jdt/internal/ui/dnd/JdtViewerDropAdapter.java
Point coordinates= new Point(event.x, event.y);
		coordinates= fViewer.getControl().toControl(coordinates);
		Rectangle bounds= getBounds(item);
		if (bounds == null) {
			return LOCATION_NONE;
		}
		if ((coordinates.y - bounds.y) < LOCATION_EPSILON) {
			return LOCATION_BEFORE;
		}
		if ((bounds.y + bounds.height - coordinates.y) < LOCATION_EPSILON) {
			return LOCATION_AFTER;
		}
		return LOCATION_ON;
	}
	/**
	 * Returns the bounds of the given item, or <code>null</code> if it is not a 
	 * valid type of item.
	 */
	private Rectangle getBounds(Item item) {
		if (item instanceof TreeItem) {
			return ((TreeItem) item).getBounds();
		}
		if (item instanceof TableItem) {
			return ((TableItem) item).getBounds(0);
		}
		return null;
	}
	/**
	 * Scrolls the widget if the given coordinates are within epsilon
	 * of the widget borders.  If scolling occurs, the viewer selection