Bug 205049 Other plug-ins should be able to define default content generator
Currently only the content generator can define which plug-ins it can be the default for - we need a way for plug-ins to refer back to the marker support for thier own generator.
bundles/org.eclipse.ui.ide/src/org/eclipse/ui/internal/provisional/views/markers/MarkerContentGenerator.java
while (filtersIterator.hasNext()) {
				MarkerFieldFilterGroup next = (MarkerFieldFilterGroup) filtersIterator
						.next();
				if (next.isEnabled())
					enabledFilters.add(next);
			}
		}
		return enabledFilters;
	}
	/**
	 * Return a collection of all of the configuration fields for this generator
	 * 
	 * @return Collection of {@link FilterConfigurationArea}
	 */
	public Collection createFilterConfigurationFields() {
		Collection result = new ArrayList();
		for (int i = 0; i < visibleFields.length; i++) {
			FilterConfigurationArea area = visibleFields[i]
					.generateFilterArea();
			if (area != null)
				result.add(area);
		}
		return result;
	}
	/**
	 * Return the id of the receiver.
	 * 
	 * @return String
	 */
	public String getId() {