public function renderPanelContent(
  PhabricatorUser $viewer,
  PhabricatorDashboardPanel $panel,
  PhabricatorDashboardPanelRenderingEngine $engine) {

  $engine = $this->getSearchEngine($panel);

  $engine->setViewer($viewer);
  $engine->setContext(PhabricatorApplicationSearchEngine::CONTEXT_PANEL);

  $key = $panel->getProperty('key');
  if ($engine->isBuiltinQuery($key)) {
    $saved = $engine->buildSavedQueryFromBuiltin($key);
  } else {
    $saved = id(new PhabricatorSavedQueryQuery())
      ->setViewer($viewer)
      ->withEngineClassNames(array(get_class($engine)))
      ->withQueryKeys(array($key))
      ->executeOne();
  }

  if (!$saved) {
    throw new Exception(
      pht(
        'Query "%s" is unknown to application search engine "%s"!',
        $key,
        get_class($engine)));
  }

  $query = $engine->buildQueryFromSavedQuery($saved);
  $pager = $engine->newPagerForSavedQuery($saved);

  if ($panel->getProperty('limit')) {
    $limit = (int)$panel->getProperty('limit');
    if ($pager->getPageSize() !== 0xFFFF) {
      $pager->setPageSize($limit);
    }
  }

  $results = $engine->executeQuery($query, $pager);

  return $engine->renderResults($results, $saved);
}

$engine = new DifferentialRevisionSearchEngine();
$saved = $engine->buildSavedQueryFromBuiltin('active');
$query = $engine->buildQueryFromSavedQuery($saved);
$pager = $engine->newPagerForSavedQuery($saved);
$pager->setPageSize(10);
$results = $engine->executeQuery($query, $pager);
$view = $engine->renderResults($results, $saved);