Alter a contextual links element before it is rendered.
This hook is invoked by contextual_pre_render_links(). The renderable array of #type 'contextual_links', containing the entire contextual links data that is passed in by reference. Further links may be added or existing links can be altered.
$element: A renderable array representing the contextual links.
$items: An associative array containing the original contextual link items, as generated by menu_contextual_links(), which were used to build $element['#links'].
hook_menu_contextual_links_alter()
function hook_contextual_links_view_alter(&$element, $items) {
// Add another class to all contextual link lists to facilitate custom
// styling.
$element['#attributes']['class'][] = 'custom-class';
}