Returns HTML for wrapping a toolbar tray.
Used in combination with theme_toolbar_tab() to create an association between a link tag in the administration bar and a tray.
array $variables: An associative array containing:
function theme_toolbar_tray_wrapper(&$variables) {
if (!empty($variables['element']['#children'])) {
$element = $variables['element'];
return '<div' . new Attribute($element['#wrapper_attributes']) . '><div class="lining clearfix">' . $element['#children'] . '</div></div>';
}
}