commit 26a18c9397f7ba25a50160bab0eaf7c4a0255332
Author: James Wilson <jwilson3@220177.no-reply.drupal.org>
Date:   Sat Jun 22 11:04:32 2013 -0400

    #713462-18: Updated patch from #13 for Drupal 8

diff --git a/core/includes/theme.inc b/core/includes/theme.inc
index 6286f65..ed3aa3e 100644
--- a/core/includes/theme.inc
+++ b/core/includes/theme.inc
@@ -2729,6 +2729,9 @@ function template_preprocess_page(&$variables) {
     if (!isset($variables['page'][$region_key])) {
       $variables['page'][$region_key] = array();
     }
+    if ($region_content = drupal_get_region_content($region_key)) {
+      $variables['page'][$region_key][]['#markup'] = $region_content;
+    }
   }
 
   // Set up layout variable.