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/action/StatusLine.java
protected void showProgress() {
		if (! fProgressIsVisible) {
			fProgressIsVisible= true;
			if (fCancelEnabled)
				showButton();
			if (fProgressBar != null)
				fProgressBar.setVisible(true);
			layout();
		}
	}
	/**
	 * @private
	 */
	void startAnimatedTask(final long timestamp) {
		if (fProgressBar != null) {
			fProgressBar.getDisplay().asyncExec(
				new Runnable() {
					public void run() {
						if (fStartTime == timestamp) {
							showProgress();
							fProgressBar.beginAnimatedTask();
						}
					}
				}
			);
		}	
	}
	/**
	 * Notifies that a subtask of the main task is beginning.
	 * Subtasks are optional; the main task might not have subtasks.