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
desc.setContentBinding(parentDesc.getContentBinding());
				desc.setDragAssistants(parentDesc.getDragAssistants());
			}
		}
	}
	/**
	 * 
	 * @param aViewerId
	 *            The viewer id for the viewer configuration
	 * @return The viewer descriptor for the given viewer id.
	 */
	public NavigatorViewerDescriptor getNavigatorViewerDescriptor(
			String aViewerId) {
		NavigatorViewerDescriptor viewerDescriptor = (NavigatorViewerDescriptor) viewerDescriptors
				.get(aViewerId);
		if (viewerDescriptor != null) {
			return viewerDescriptor;
		}
		synchronized (viewerDescriptors) {
			viewerDescriptor = (NavigatorViewerDescriptor) viewerDescriptors
					.get(aViewerId);
			if (viewerDescriptor == null) {
				viewerDescriptor = new NavigatorViewerDescriptor(aViewerId);
				viewerDescriptors.put(viewerDescriptor.getViewerId(),
						viewerDescriptor);
			}
		}
		return viewerDescriptor;
	}
	private class NavigatorViewerDescriptorRegistry extends RegistryReader