Allow WP_List_Table::_js_vars() to take an array of additional args to add. Allows us to have a single variable printing data when child classes need more data. Also, fix compact() call in [20094]. see #19815.

git-svn-id: https://develop.svn.wordpress.org/trunk@20100 602fd350-edb4-49c9-b593-d223f7449a82

wp-admin/includes/class-wp-list-table.php

@@ -903,7 +903,7 @@ class WP_List_Table {
 	 *
 	 * @access private
 	 */
-	function _js_vars() {
+	function _js_vars( $extra_args = array() ) {
 		$current_screen = get_current_screen();
 
 		$args = array(
@@ -914,6 +914,9 @@ class WP_List_Table {
 			)
 		);
 
+		if ( is_array( $extra_args ) )
+			$args = array_merge( $args, $extra_args );
+
 		printf( "<script type='text/javascript'>list_args = %s;</script>\n", json_encode( $args ) );
 	}
 }