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/dialogs/ErrorDialog.java
* @return the code of the button that was pressed that resulted in this dialog
	 *     closing.  This will be <code>Dialog.OK</code> if the OK button was 
	 * 	   pressed, or <code>Dialog.CANCEL</code> if this dialog's close window 
	 *     decoration or the ESC key was used.
	 */
	public static int openError(
		Shell parent,
		String dialogTitle,
		String message,
		IStatus status) {
		return openError(
			parent,
			dialogTitle,
			message,
			status,
			IStatus.OK | IStatus.INFO | IStatus.WARNING | IStatus.ERROR);
	}
	/**
	 * Opens an error dialog to display the given error.  Use this method if the
	 * error object being displayed contains child items <it>and</it> you wish to
	 * specify a mask which will be used to filter the displaying of these
	 * children.  The error dialog will only be displayed if there is at
	 * least one child status matching the mask.
	 *
	 * @param parentShell the parent shell of the dialog, or <code>null</code> if none
	 * @param dialogTitle the title to use for this dialog,
	 *   or <code>null</code> to indicate that the default title should be used
	 * @param message the message to show in this dialog, 
	 *   or <code>null</code> to indicate that the error's message should be shown
	 *   as the primary message