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
boolean andFilters() {
		return andFilters;
	}
	/**
	 * Set whether the filters are being ANDed or ORed.
	 * 
	 * @param and
	 */
	void setAndFilters(boolean and) {
		andFilters = and;
	}
	/**
	 * Set the primary sort field for the receiver.
	 * 
	 * @param field
	 */
	void setPrimarySortField(MarkerField field) {
		getComparator().setPrimarySortField(field);
	}
	/**
	 * Return whether or not markerField is the primary sort field.
	 * 
	 * @param markerField
	 * @return boolean
	 */
	boolean isPrimarySortField(MarkerField markerField) {
		return getComparator().getPrimarySortField().equals(markerField);
	}
	/**
	 * Get the sort direction of field