/**
* Combine css files and script files before renderHead.
* @param string the output to be inserted with scripts.
*/
public function renderHead(&$output)
{
if ($this->combineCssFiles) {
$this->combineCssFiles();
}
if ($this->combineScriptFiles && $this->enableJavaScript) {
$this->combineScriptFiles(self::POS_HEAD);
}
parent::renderHead($output);
}
