Implement DiffusionMercurialContainsQuery in Diffusion

Summary:
Currently, we have no implementation, so all Mercurial commits show "None" for "Branches".

Instead, implement this method.

Test Plan: {F34076}

Reviewers: DurhamGoode, vrana, chad

Reviewed By: chad

CC: aran

Differential Revision: https://secure.phabricator.com/D5145

src/applications/diffusion/query/contains/DiffusionMercurialContainsQuery.php

@@ -3,10 +3,16 @@
 final class DiffusionMercurialContainsQuery extends DiffusionContainsQuery {
 
   protected function executeQuery() {
+    $request = $this->getRequest();
+    $repository = $request->getRepository();
+    list($contains) = $repository->execxLocalCommand(
+      'log --template %s --limit 1 --rev %s --',
+      '{branch}',
+      $request->getCommit());
 
-    // TODO: Implement this.
-
-    return array();
+    return array(
+      trim($contains) => $request->getCommit(),
+    );
   }
 
 }