Bug 330864 Add ability to find context for a UI element
bundles/org.eclipse.e4.core.contexts.debug/src/org/eclipse/e4/core/internal/contexts/debug/ui/ContextTreeProvider.java
private class RefreshJob extends UIJob {
		public RefreshJob(Display display) {
			super(display, "Context debug update job"); 
			setSystem(true);
		}
		public IStatus runInUIThread(IProgressMonitor monitor) {
			if (monitor.isCanceled())
				return Status.OK_STATUS;
			if (view != null)
				view.refresh();
			return Status.OK_STATUS;
		}
	}
	final private static int REFRESH_DELAY = 5000; 
	static private Set<WeakReference<EclipseContext>> activeContexts = new HashSet<WeakReference<EclipseContext>>();