Bug 198971 [CommonNavigator] Provide extension schema for setting help ID
I haven't been able to find a way to set the help ID for a view using the common resource navigator. It seems that having schema support for this would be the best way to handle this.
bundles/org.eclipse.ui.navigator/src/org/eclipse/ui/internal/navigator/extensions/NavigatorViewerDescriptorManager.java
private static final NavigatorViewerDescriptorManager INSTANCE = new NavigatorViewerDescriptorManager();
	private final Map viewerDescriptors = new HashMap();
	
	/**
	 * @return The intialized singleton instance of the viewer descriptor
	 *         registry.
	 */
	public static NavigatorViewerDescriptorManager getInstance() {
		return INSTANCE;
	}
	protected NavigatorViewerDescriptorManager() {
		new NavigatorViewerDescriptorRegistry().readRegistry();
		
		Iterator it = viewerDescriptors.values().iterator();
		while (it.hasNext()) {
			NavigatorViewerDescriptor desc = (NavigatorViewerDescriptor) it.next();
			NavigatorViewerDescriptor parentDesc = (NavigatorViewerDescriptor) viewerDescriptors.get(desc.getInheritBindingsFromViewer());
			if (parentDesc != null) {
				desc.setActionBinding(parentDesc.getActionBinding());