class RouteSubscriber

1. 8.x drupal/core/modules/views/lib/Drupal/views/EventSubscriber/RouteSubscriber.php \Drupal\views\EventSubscriber\RouteSubscriber
2. 8.x drupal/core/modules/field_ui/lib/Drupal/field_ui/Routing/RouteSubscriber.php \Drupal\field_ui\Routing\RouteSubscriber
3. 8.x drupal/core/modules/rest/lib/Drupal/rest/EventSubscriber/RouteSubscriber.php \Drupal\rest\EventSubscriber\RouteSubscriber

DisplayPageTest.php in drupal/core/modules/views/lib/Drupal/views/Tests/Plugin/DisplayPageTest.php

Contains \Drupal\views\Tests\Plugin\DisplayPageTest.

views.services.yml in drupal/core/modules/views/views.services.yml

drupal/core/modules/views/views.services.yml

views.route_subscriber in drupal/core/modules/views/views.services.yml

Drupal\views\EventSubscriber\RouteSubscriber

class RouteSubscriber implements EventSubscriberInterface {

  /**
   * {@inheritdoc}
   */
  public static function getSubscribedEvents() {
    $events[RoutingEvents::DYNAMIC] = 'dynamicRoutes';
    return $events;
  }

  /**
   * Adds routes defined by all views.
   *
   * @param \Drupal\Core\Routing\RouteBuildEvent $event
   *   The route building event.
   */
  public function dynamicRoutes(RouteBuildEvent $event) {
    $collection = $event
      ->getRouteCollection();
    $views = views_get_applicable_views('uses_route');
    foreach ($views as $data) {
      list($view, $display_id) = $data;
      if ($view
        ->setDisplay($display_id) && ($display = $view->displayHandlers
        ->get($display_id))) {
        if ($display instanceof DisplayRouterInterface) {
          $display
            ->collectRoutes($collection);
        }
      }
      $view
        ->destroy();
    }
  }

}