Bug 29163 SafeRunnable needs to be accessible in JFace
We need to be able to access the SafeRunnable in JFace in order that some error protection can be added to preferences and properties dialogs.
bundles/org.eclipse.ui.workbench/extensions/org/eclipse/jface/operation/AccumulatingProgressMonitor.java
/**
	 * The display.
	 */
	private Display display;
	/**
	 * The collector, or <code>null</code> if none.
	 */
	private Collector collector;
	
	private class Collector implements Runnable {
		private String subTask;
		private double worked;
		private IProgressMonitor monitor;