Add paste policy storage

Summary: Add storage to Pastes for view policies.

Test Plan: Set policies on pastes, see next diff.

Reviewers: vrana, btrahan

Reviewed By: btrahan

CC: aran

Maniphest Tasks: T603

Differential Revision: https://secure.phabricator.com/D3474

src/applications/paste/storage/PhabricatorPaste.php

@@ -25,6 +25,7 @@ final class PhabricatorPaste extends PhabricatorPasteDAO
   protected $filePHID;
   protected $language;
   protected $parentPHID;
+  protected $viewPolicy;
 
   private $content;
 
@@ -52,7 +53,7 @@ final class PhabricatorPaste extends PhabricatorPasteDAO
 
   public function getPolicy($capability) {
     if ($capability == PhabricatorPolicyCapability::CAN_VIEW) {
-      return PhabricatorPolicies::POLICY_USER;
+      return $this->viewPolicy;
     }
     return PhabricatorPolicies::POLICY_NOONE;
   }

src/infrastructure/storage/patch/PhabricatorBuiltinPatchList.php

@@ -976,6 +976,10 @@ final class PhabricatorBuiltinPatchList extends PhabricatorSQLPatchList {
         'type'    => 'sql',
         'name'    => $this->getPatchPath('ponder-comments.sql'),
       ),
+      'pastepolicy.sql' => array(
+        'type'    => 'sql',
+        'name'    => $this->getPatchPath('pastepolicy.sql'),
+      ),
     );
   }