display.services.yml

services:
  html_fragment_renderer:
    class: Drupal\display\DisplayHtmlFragmentRenderer
    arguments: ['@language_manager']

DisplayHtmlFragmentRenderer.php

<?php

/**
 * @file
 * Contains \Drupal\display\DisplayHtmlFragmentRenderer
 */

namespace Drupal\display;

use Drupal\Core\Language\Language;
use Drupal\Core\Language\LanguageManager;
use Drupal\Core\Page\DefaultHtmlFragmentRenderer;
use Drupal\Core\Page\HtmlFragment;
use Drupal\Core\Page\HtmlFragmentRendererInterface;
use Drupal\Core\Page\HtmlPage;

/**
 * Default page rendering engine.
 */
class DisplayHtmlFragmentRenderer extends DefaultHtmlFragmentRenderer {

  /**
   * {@inheritdoc}
   */
  public function render(HtmlFragment $fragment, $status_code = 200) {
    // Converts the given HTML fragment which represents the main content region
    // of the page into a render array.
    $page_content['main'] = array(
      '#markup' => $fragment->getContent(),
      '#cache' => array('tags' => $fragment->getCacheTags()),
    );
    $page_content['#title'] = $fragment->getTitle();

    // Build the full page array by calling drupal_prepare_page(), which invokes
    // hook_page_build(). This adds the other regions to the page.
    $page_array = drupal_prepare_page($page_content);

    // Build the HtmlPage object.
    $page = new HtmlPage('', array(), $fragment->getTitle());
    $page = $this->preparePage($page, $page_array);
    $page->setBodyTop(drupal_render($page_array['page_top']));
    $page->setBodyBottom(drupal_render($page_array['page_bottom']));
    $page->setContent(drupal_render($page_array));
    // Collect cache tags for all the content in all the regions on the page.
    $tags = $page_array['#cache']['tags'];
    // Enforce the generic "content" cache tag on all pages.
    // @todo Remove the "content" cache tag. @see https://drupal.org/node/2124957
    $tags['content'] = TRUE;
    $page->setCacheTags($tags);
    $page->setStatusCode($status_code);

    return $page;
  }

}