Index: wp-includes/script-loader.php
===================================================================
--- wp-includes/script-loader.php	(revision 27232)
+++ wp-includes/script-loader.php	(working copy)
@@ -578,6 +578,11 @@
 
 	// Register a stylesheet for the selected admin color scheme.
 	$colors_url = false;
+
+	if ( function_exists('register_admin_color_schemes') ) {
+		register_admin_color_schemes();
+	}
+
 	if ( ! empty( $GLOBALS['_wp_admin_css_colors'] ) ) {
 		$color = get_user_option( 'admin_color' );
 		if ( ! $color || ! isset( $GLOBALS['_wp_admin_css_colors'][ $color ] ) ) {