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
getAllFilters().add(newGroup);
	}
	/**
	 * Set the category group
	 * 
	 * @param group
	 */
	void setCategoryGroup(MarkerGroup group) {
		this.categoryGroup = group;
	}
	/**
	 * Set the filters for the receiver.
	 * 
	 * @param newFilters
	 */
	public void setFilters(Collection newFilters) {
		filters = newFilters;
		enabledFilters = null;
		XMLMemento memento = XMLMemento.createWriteRoot(TAG_FILTERS_SECTION);
		writeFiltersSettings(memento);
		StringWriter writer = new StringWriter();
		try {
			memento.save(writer);
		} catch (IOException e) {
			IDEWorkbenchPlugin.getDefault().getLog().log(Util.errorStatus(e));
		}
		IDEWorkbenchPlugin.getDefault().getPreferenceStore().putValue(
				getMementoPreferenceName(), writer.toString());
		IDEWorkbenchPlugin.getDefault().savePluginPreferences();
	}