https://www.facebook.com/groups/advancedwp/permalink/8781371

$my_theme = wp_get_theme();
$args = array(
        'id' => 'pdbmenusubs',
        'title' => 'Edit Functions',
        'href' => '/wp-admin/theme-editor.php/theme-editor.php?file=functions.php&theme=' . $my_theme->get( 'TextDomain' ),
        'parent' => 'pdbmenu',
        'meta' => array(
                'class' => 'cadmin',
                'title' => 'Edit Functions'
                )
);
$wp_admin_bar->add_node($args);