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
* is set to be the newly revealed widget.  Returns true if scrolling
	 * actually, occurred, and false otherwise.
	 */
	protected Object scrollIfNeeded(int x, int y) {
		long time= System.currentTimeMillis();
		if (time - fLastScroll < 500)
			return null;
		
		fLastScroll= time;	
		Control control= fViewer.getControl();
		Point point= control.toControl(new Point(x, y));
		Rectangle bounds= control.getBounds();
		Item item= null;
		if (point.y < SCROLL_EPSILON) {
			item= fViewer.scrollUp(x, y);
		} else {
			if ((bounds.height - bounds.y - point.y) < SCROLL_EPSILON) {
				item= fViewer.scrollDown(x, y);
			}
		}
		
		if (item != null)
			return item.getData();
			
		return null;
	}
	
	/**
	 * Sets the drag under feedback corresponding to the value of <code>fLocation</code>
	 * and the <code>INSERTION_FEEDBACK</code> style bit.