Return commit information for Revision "close" and "update" transactions over the Conduit API

Summary: Depends on D19175. Ref T13099. This fills in "close" and "update" transactions so that they show which commit(s) caused the action.

Test Plan: Used `transaction.search` to query some revisions, saw commit PHID information.

Maniphest Tasks: T13099

Differential Revision: https://secure.phabricator.com/D19176

src/applications/differential/engine/DifferentialDiffExtractionEngine.php

@@ -284,7 +284,8 @@ final class DifferentialDiffExtractionEngine extends Phobject {
       ->setTransactionType($type_update)
       ->setIgnoreOnNoEffect(true)
       ->setNewValue($new_diff->getPHID())
-      ->setMetadataValue('isCommitUpdate', true);
+      ->setMetadataValue('isCommitUpdate', true)
+      ->setMetadataValue('commitPHIDs', array($commit->getPHID()));
 
     foreach ($more_xactions as $more_xaction) {
       $xactions[] = $more_xaction;

src/applications/differential/xaction/DifferentialRevisionCloseTransaction.php

@@ -136,4 +136,23 @@ final class DifferentialRevisionCloseTransaction
       $this->renderObject());
   }
 
+  public function getTransactionTypeForConduit($xaction) {
+    return 'close';
+  }
+
+  public function getFieldValuesForConduit($object, $data) {
+    $commit_phid = $object->getMetadataValue('commitPHID');
+
+    if ($commit_phid) {
+      $commit_phids = array($commit_phid);
+    } else {
+      $commit_phids = array();
+    }
+
+    return array(
+      'commitPHIDs' => $commit_phids,
+    );
+  }
+
+
 }

src/applications/differential/xaction/DifferentialRevisionUpdateTransaction.php

@@ -182,4 +182,18 @@ final class DifferentialRevisionUpdateTransaction
     }
   }
 
+  public function getTransactionTypeForConduit($xaction) {
+    return 'update';
+  }
+
+  public function getFieldValuesForConduit($object, $data) {
+    $commit_phids = $object->getMetadataValue('commitPHIDs', array());
+
+    return array(
+      'old' => $object->getOldValue(),
+      'new' => $object->getNewValue(),
+      'commitPHIDs' => $commit_phids,
+    );
+  }
+
 }