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
IDialogConstants.OK_ID,
			IDialogConstants.OK_LABEL,
			true);
		if (status.isMultiStatus()) {
			detailsButton =
				createButton(
					parent,
					IDialogConstants.DETAILS_ID,
					IDialogConstants.SHOW_DETAILS_LABEL,
					false);
		}
	}
	/**
	 * This implementation of the <code>Dialog</code> framework 
	 * method creates and lays out a composite and calls 
	 * <code>createMessageArea</code> and <code>createCustomArea</code>
	 * to populate it. Subclasses should override <code>createCustomArea</code>
	 * to add contents below the message.
	 */
	protected Control createDialogArea(Composite parent) {
		createMessageArea(parent);
		
		Composite composite = new Composite(parent, SWT.NONE);
		GridLayout layout = new GridLayout();
		layout.marginHeight =
			convertVerticalDLUsToPixels(IDialogConstants.VERTICAL_MARGIN);
		layout.marginWidth =
			convertHorizontalDLUsToPixels(IDialogConstants.HORIZONTAL_MARGIN);
		layout.verticalSpacing =
			convertVerticalDLUsToPixels(IDialogConstants.VERTICAL_SPACING);