Ability to add reviewers while requesting review

Summary: It makes perfect sense to add more reviewers while requesting review.

Test Plan:
Request review. Verify that Add Reviewers field shows and works.
Add some reviewer. Verify that comment preview works.
Submit. Verify that reviewers are saved and displayed.

Reviewers: epriestley

Reviewed By: epriestley

CC: aran, epriestley

Differential Revision: https://secure.phabricator.com/D1473

src/applications/differential/controller/commentpreview/DifferentialCommentPreviewController.php

@@ -42,7 +42,8 @@ class DifferentialCommentPreviewController extends DifferentialController {
     $handles = array($author_phid);
 
     $reviewers = $request->getStr('reviewers');
-    if ($action == DifferentialAction::ACTION_ADDREVIEWERS && $reviewers) {
+    if (($action == DifferentialAction::ACTION_ADDREVIEWERS
+        || $action == DifferentialAction::ACTION_REQUEST) && $reviewers) {
       $reviewers = explode(',', $reviewers);
       $comment->setMetadata(array(
         DifferentialComment::METADATA_ADDED_REVIEWERS => $reviewers));