Bug 177176 [Field Assist] [API] - Add 7x7 information control decoration to FieldDecorationRegistry
Please see attached zip file containing icon recommended by media design team.
bundles/org.eclipse.jface/src/org/eclipse/jface/fieldassist/FieldDecorationRegistry.java
*            the String id used to access the decoration.
	 * @return the FieldDecoration with the specified id, or <code>null</code>
	 *         if there is no decoration with the specified id.
	 */
	public FieldDecoration getFieldDecoration(String id) {
		Object entry = decorations.get(id);
		if (entry == null) {
			return null;
		}
		return ((Entry) entry).getDecoration();
	}
	/*
	 * The maximum decoration width and height must be recomputed. Typically
	 * called in response to adding, removing, or replacing a decoration.
	 */
	private void recomputeMaximums() {
		Iterator entries = decorations.values().iterator();
		
		maxDecorationHeight = 0;
		maxDecorationWidth = 0;
		while (entries.hasNext()) {
			Image image = ((Entry)entries.next()).getDecoration().getImage();
			if (image != null) {
				maxDecorationHeight = Math.max(maxDecorationHeight, image.getBounds().height);
				maxDecorationWidth = Math.max(maxDecorationWidth, image.getBounds().width);
			}
		}
	}
}