Always include the current user as a selectable policy

Summary: Ref T4136. After Passphrase, user policies work correctly in this dropdown. Providing this option improves consistency and makes it easier to create, e.g., a private repository (where "no one" does not include the viewer, because they don't own the resulting object).

Test Plan: Set an object's policy to my user policy.

Reviewers: btrahan

Reviewed By: btrahan

CC: aran

Maniphest Tasks: T4136

Differential Revision: https://secure.phabricator.com/D7858

src/applications/policy/query/PhabricatorPolicyQuery.php

@@ -190,6 +190,11 @@ final class PhabricatorPolicyQuery
       foreach ($projects as $project) {
         $phids[] = $project->getPHID();
       }
+
+      // Include the "current viewer" policy. This improves consistency, but
+      // is also useful for creating private instances of normally-shared object
+      // types, like repositories.
+      $phids[] = $viewer->getPHID();
     }
 
     $capabilities = $this->object->getCapabilities();