Index: wp-admin/customize.php
===================================================================
--- wp-admin/customize.php	(revision 40746)
+++ wp-admin/customize.php	(working copy)
@@ -133,6 +133,7 @@
 	<form id="customize-controls" class="wrap wp-full-overlay-sidebar">
 		<div id="customize-header-actions" class="wp-full-overlay-header">
 			<?php
+            do_action( 'customize_header_actions' );
 			$save_text = $wp_customize->is_theme_active() ? __( 'Save &amp; Publish' ) : __( 'Save &amp; Activate' );
 			$save_attrs = array();
 			if ( ! current_user_can( get_post_type_object( 'customize_changeset' )->cap->publish_posts ) ) {