Bug 202316 [Forms] Add gradient sharing support for FormHeading
bundles/org.eclipse.ui.forms/src/org/eclipse/ui/internal/forms/widgets/FormHeading.java
IMessageToolTipManager {
		public void createToolTip(Control control, boolean imageLabel) {
		}
		public void update() {
			String details = getMessageType() == 0 ? null : MessageManager
					.createDetails(getChildrenMessages());
			if (messageRegion != null)
				messageRegion.updateToolTip(details);
			if (getMessageType() > 0
					&& (details == null || details.length() == 0))
				details = getMessage();
			titleRegion.updateToolTip(details);
		}
	}
	private class GradientInfo {
		Color[] gradientColors;
		int[] percents;
		boolean vertical;
	}
	private class FormHeadingLayout extends Layout implements ILayoutExtension {