Bug 158606 make BaseLabelProvider public
bundles/org.eclipse.jface/src/org/eclipse/jface/viewers/BaseLabelProvider.java
/* (non-Javadoc)
     * Method declared on IBaseLabelProvider.
     */
    public void addListener(ILabelProviderListener listener) {
        addListenerObject(listener);
    }
    /**
     * The <code>BaseLabelProvider</code> implementation of this 
     * <code>IBaseLabelProvider</code> method does nothing. Subclasses may extend.
     */
    public void dispose() {
    }
    
    /**
     * The <code>BaseLabelProvider</code> implementation of this 
     * <code>IBaseLabelProvider</code> method returns <code>true</code>. Subclasses may 
     * override.
     */
    public boolean isLabelProperty(Object element, String property) {
        return true;
    }