Add "phabricator-remarkup" to transaction comments

Summary: Fixes T2596. We currently omit this, so we don't get some styling (lists, e.g.)

Test Plan: Viewed a remarkup list in Macro, Pholio.

Reviewers: chad, vrana

Reviewed By: chad

CC: aran

Maniphest Tasks: T2596

Differential Revision: https://secure.phabricator.com/D5114

src/applications/transactions/storage/PhabricatorApplicationTransactionComment.php

@@ -71,7 +71,13 @@ abstract class PhabricatorApplicationTransactionComment
 
 
   public function didMarkupText($field, $output, PhutilMarkupEngine $engine) {
-    return $output;
+    require_celerity_resource('phabricator-remarkup-css');
+    return phutil_tag(
+      'div',
+      array(
+        'class' => 'phabricator-remarkup',
+      ),
+      $output);
   }