Optional body class for dust background.

Summary: This adds an option dust background for certain application designs, like Macro and Pholio to help make the list views pop more.

Test Plan: Reviewed Macro and Pholio.

Reviewers: epriestley

Reviewed By: epriestley

CC: aran, Korvin

Differential Revision: https://secure.phabricator.com/D5209

src/applications/base/controller/PhabricatorController.php

@@ -171,6 +171,7 @@ abstract class PhabricatorController extends AphrontController {
     }
 
     $page->setShowChrome(idx($options, 'chrome', true));
+    $page->setDust(idx($options, 'dust', false));
 
     $application_menu = $this->buildApplicationMenu();
     if ($application_menu) {