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
if (! fProgressIsVisible) {
			if (System.currentTimeMillis() - fStartTime > DELAY_PROGRESS)
				showProgress();
		}
			
		if (fProgressBar != null) {
			fProgressBar.worked(work);
		}	
	}
	/**
	 * Returns true if the user does some UI action to cancel this operation.
	 * (like hitting the Cancel button on the progress dialog).
	 * The long running operation typically polls isCanceled().
	 */
	public boolean isCanceled() {
		return fIsCanceled;
	}
	/**
	 * Returns <code>true</true> if the ProgressIndication provides UI for canceling
	 * a long running operation.
	 */
	public boolean isCancelEnabled() {
		return fCancelEnabled;
	}
	/**
	 * Sets the cancel status. This method is usually called with the 
	 * argument false if a client wants to abort a cancel action.
	 */
	public void setCanceled(boolean b) {
		fIsCanceled = b;