Source

File: wp-admin/includes/class-wp-upgrader-skin.php

public function __construct( $args = array() ) {
		$defaults      = array(
			'url'     => '',
			'nonce'   => '',
			'title'   => '',
			'context' => false,
		);
		$this->options = wp_parse_args( $args, $defaults );
	}