Include owners packages in the MailableFunction datasource

Summary:
Ref T13151. See PHI684. Currently, the `MailableFunction` datasource does not include Owners packages, but they are valid subscribers and the `Mailable` datasource includes them.

Include them in the `MailableFunction` datasource, too.

Test Plan: Searched for revisions with particular package subscribers, got expected results in the UI (tokenizer knew about packages) and response.

Reviewers: amckinley, jmeador

Reviewed By: jmeador

Maniphest Tasks: T13151

Differential Revision: https://secure.phabricator.com/D19476

src/applications/metamta/typeahead/PhabricatorMetaMTAMailableFunctionDatasource.php

@@ -8,7 +8,8 @@ final class PhabricatorMetaMTAMailableFunctionDatasource
   }
 
   public function getPlaceholderText() {
-    return pht('Type a username, project, mailing list, or function...');
+    return pht(
+      'Type a username, project, mailing list, package, or function...');
   }
 
   public function getDatasourceApplicationClass() {
@@ -21,6 +22,7 @@ final class PhabricatorMetaMTAMailableFunctionDatasource
       new PhabricatorPeopleDatasource(),
       new PhabricatorProjectMembersDatasource(),
       new PhabricatorProjectDatasource(),
+      new PhabricatorOwnersPackageDatasource(),
     );
   }
 

src/applications/search/field/PhabricatorSearchSubscribersField.php

@@ -10,6 +10,7 @@ final class PhabricatorSearchSubscribersField
   protected function getValueFromRequest(AphrontRequest $request, $key) {
     $allow_types = array(
       PhabricatorProjectProjectPHIDType::TYPECONST,
+      PhabricatorOwnersPackagePHIDType::TYPECONST,
     );
     return $this->getUsersFromRequest($request, $key, $allow_types);
   }