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diff --git a/web/core/modules/system/src/Controller/SystemController.php b/web/core/modules/system/src/Controller/SystemController.php
new file mode 100644
index 000000000..4af1dcb85
--- /dev/null
+++ b/web/core/modules/system/src/Controller/SystemController.php
@@ -0,0 +1,327 @@
+<?php
+
+namespace Drupal\system\Controller;
+
+use Drupal\Core\Cache\CacheableMetadata;
+use Drupal\Core\Controller\ControllerBase;
+use Drupal\Core\Extension\ThemeHandlerInterface;
+use Drupal\Core\Form\FormBuilderInterface;
+use Drupal\Core\Menu\MenuLinkTreeInterface;
+use Drupal\Core\Menu\MenuTreeParameters;
+use Drupal\Core\Theme\ThemeAccessCheck;
+use Drupal\Core\Url;
+use Drupal\system\SystemManager;
+use Symfony\Component\DependencyInjection\ContainerInterface;
+
+/**
+ * Returns responses for System routes.
+ */
+class SystemController extends ControllerBase {
+
+  /**
+   * System Manager Service.
+   *
+   * @var \Drupal\system\SystemManager
+   */
+  protected $systemManager;
+
+  /**
+   * The theme access checker service.
+   *
+   * @var \Drupal\Core\Theme\ThemeAccessCheck
+   */
+  protected $themeAccess;
+
+  /**
+   * The form builder service.
+   *
+   * @var \Drupal\Core\Form\FormBuilderInterface
+   */
+  protected $formBuilder;
+
+  /**
+   * The theme handler service.
+   *
+   * @var \Drupal\Core\Extension\ThemeHandlerInterface
+   */
+  protected $themeHandler;
+
+  /**
+   * The menu link tree service.
+   *
+   * @var \Drupal\Core\Menu\MenuLinkTreeInterface
+   */
+  protected $menuLinkTree;
+
+  /**
+   * Constructs a new SystemController.
+   *
+   * @param \Drupal\system\SystemManager $systemManager
+   *   System manager service.
+   * @param \Drupal\Core\Theme\ThemeAccessCheck $theme_access
+   *   The theme access checker service.
+   * @param \Drupal\Core\Form\FormBuilderInterface $form_builder
+   *   The form builder.
+   * @param \Drupal\Core\Extension\ThemeHandlerInterface $theme_handler
+   *   The theme handler.
+   * @param \Drupal\Core\Menu\MenuLinkTreeInterface $menu_link_tree
+   *   The menu link tree service.
+   */
+  public function __construct(SystemManager $systemManager, ThemeAccessCheck $theme_access, FormBuilderInterface $form_builder, ThemeHandlerInterface $theme_handler, MenuLinkTreeInterface $menu_link_tree) {
+    $this->systemManager = $systemManager;
+    $this->themeAccess = $theme_access;
+    $this->formBuilder = $form_builder;
+    $this->themeHandler = $theme_handler;
+    $this->menuLinkTree = $menu_link_tree;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public static function create(ContainerInterface $container) {
+    return new static(
+      $container->get('system.manager'),
+      $container->get('access_check.theme'),
+      $container->get('form_builder'),
+      $container->get('theme_handler'),
+      $container->get('menu.link_tree')
+    );
+  }
+
+  /**
+   * Provide the administration overview page.
+   *
+   * @param string $link_id
+   *   The ID of the administrative path link for which to display child links.
+   *
+   * @return array
+   *   A renderable array of the administration overview page.
+   */
+  public function overview($link_id) {
+    // Check for status report errors.
+    if ($this->systemManager->checkRequirements() && $this->currentUser()->hasPermission('administer site configuration')) {
+      drupal_set_message($this->t('One or more problems were detected with your Drupal installation. Check the <a href=":status">status report</a> for more information.', [':status' => $this->url('system.status')]), 'error');
+    }
+    // Load all menu links below it.
+    $parameters = new MenuTreeParameters();
+    $parameters->setRoot($link_id)->excludeRoot()->setTopLevelOnly()->onlyEnabledLinks();
+    $tree = $this->menuLinkTree->load(NULL, $parameters);
+    $manipulators = [
+      ['callable' => 'menu.default_tree_manipulators:checkAccess'],
+      ['callable' => 'menu.default_tree_manipulators:generateIndexAndSort'],
+    ];
+    $tree = $this->menuLinkTree->transform($tree, $manipulators);
+    $tree_access_cacheability = new CacheableMetadata();
+    $blocks = [];
+    foreach ($tree as $key => $element) {
+      $tree_access_cacheability = $tree_access_cacheability->merge(CacheableMetadata::createFromObject($element->access));
+
+      // Only render accessible links.
+      if (!$element->access->isAllowed()) {
+        continue;
+      }
+
+      $link = $element->link;
+      $block['title'] = $link->getTitle();
+      $block['description'] = $link->getDescription();
+      $block['content'] = [
+        '#theme' => 'admin_block_content',
+        '#content' => $this->systemManager->getAdminBlock($link),
+      ];
+
+      if (!empty($block['content']['#content'])) {
+        $blocks[$key] = $block;
+      }
+    }
+
+    if ($blocks) {
+      ksort($blocks);
+      $build = [
+        '#theme' => 'admin_page',
+        '#blocks' => $blocks,
+      ];
+      $tree_access_cacheability->applyTo($build);
+      return $build;
+    }
+    else {
+      $build = [
+        '#markup' => $this->t('You do not have any administrative items.'),
+      ];
+      $tree_access_cacheability->applyTo($build);
+      return $build;
+    }
+  }
+
+  /**
+   * Sets whether the admin menu is in compact mode or not.
+   *
+   * @param string $mode
+   *   Valid values are 'on' and 'off'.
+   *
+   * @return \Symfony\Component\HttpFoundation\RedirectResponse
+   */
+  public function compactPage($mode) {
+    user_cookie_save(['admin_compact_mode' => ($mode == 'on')]);
+    return $this->redirect('<front>');
+  }
+
+  /**
+   * Provides a single block from the administration menu as a page.
+   */
+  public function systemAdminMenuBlockPage() {
+    return $this->systemManager->getBlockContents();
+  }
+
+  /**
+   * Returns a theme listing.
+   *
+   * @return string
+   *   An HTML string of the theme listing page.
+   *
+   * @todo Move into ThemeController.
+   */
+  public function themesPage() {
+    $config = $this->config('system.theme');
+    // Get all available themes.
+    $themes = $this->themeHandler->rebuildThemeData();
+    uasort($themes, 'system_sort_modules_by_info_name');
+
+    $theme_default = $config->get('default');
+    $theme_groups  = ['installed' => [], 'uninstalled' => []];
+    $admin_theme = $config->get('admin');
+    $admin_theme_options = [];
+
+    foreach ($themes as &$theme) {
+      if (!empty($theme->info['hidden'])) {
+        continue;
+      }
+      $theme->is_default = ($theme->getName() == $theme_default);
+      $theme->is_admin = ($theme->getName() == $admin_theme || ($theme->is_default && $admin_theme == '0'));
+
+      // Identify theme screenshot.
+      $theme->screenshot = NULL;
+      // Create a list which includes the current theme and all its base themes.
+      if (isset($themes[$theme->getName()]->base_themes)) {
+        $theme_keys = array_keys($themes[$theme->getName()]->base_themes);
+        $theme_keys[] = $theme->getName();
+      }
+      else {
+        $theme_keys = [$theme->getName()];
+      }
+      // Look for a screenshot in the current theme or in its closest ancestor.
+      foreach (array_reverse($theme_keys) as $theme_key) {
+        if (isset($themes[$theme_key]) && file_exists($themes[$theme_key]->info['screenshot'])) {
+          $theme->screenshot = [
+            'uri' => $themes[$theme_key]->info['screenshot'],
+            'alt' => $this->t('Screenshot for @theme theme', ['@theme' => $theme->info['name']]),
+            'title' => $this->t('Screenshot for @theme theme', ['@theme' => $theme->info['name']]),
+            'attributes' => ['class' => ['screenshot']],
+          ];
+          break;
+        }
+      }
+
+      if (empty($theme->status)) {
+        // Ensure this theme is compatible with this version of core.
+        $theme->incompatible_core = !isset($theme->info['core']) || ($theme->info['core'] != \DRUPAL::CORE_COMPATIBILITY);
+        // Require the 'content' region to make sure the main page
+        // content has a common place in all themes.
+        $theme->incompatible_region = !isset($theme->info['regions']['content']);
+        $theme->incompatible_php = version_compare(phpversion(), $theme->info['php']) < 0;
+        // Confirm that all base themes are available.
+        $theme->incompatible_base = (isset($theme->info['base theme']) && !($theme->base_themes === array_filter($theme->base_themes)));
+        // Confirm that the theme engine is available.
+        $theme->incompatible_engine = isset($theme->info['engine']) && !isset($theme->owner);
+      }
+      $theme->operations = [];
+      if (!empty($theme->status) || !$theme->incompatible_core && !$theme->incompatible_php && !$theme->incompatible_base && !$theme->incompatible_engine) {
+        // Create the operations links.
+        $query['theme'] = $theme->getName();
+        if ($this->themeAccess->checkAccess($theme->getName())) {
+          $theme->operations[] = [
+            'title' => $this->t('Settings'),
+            'url' => Url::fromRoute('system.theme_settings_theme', ['theme' => $theme->getName()]),
+            'attributes' => ['title' => $this->t('Settings for @theme theme', ['@theme' => $theme->info['name']])],
+          ];
+        }
+        if (!empty($theme->status)) {
+          if (!$theme->is_default) {
+            $theme_uninstallable = TRUE;
+            if ($theme->getName() == $admin_theme) {
+              $theme_uninstallable = FALSE;
+            }
+            // Check it isn't the base of theme of an installed theme.
+            foreach ($theme->required_by as $themename => $dependency) {
+              if (!empty($themes[$themename]->status)) {
+                $theme_uninstallable = FALSE;
+              }
+            }
+            if ($theme_uninstallable) {
+              $theme->operations[] = [
+                'title' => $this->t('Uninstall'),
+                'url' => Url::fromRoute('system.theme_uninstall'),
+                'query' => $query,
+                'attributes' => ['title' => $this->t('Uninstall @theme theme', ['@theme' => $theme->info['name']])],
+              ];
+            }
+            $theme->operations[] = [
+              'title' => $this->t('Set as default'),
+              'url' => Url::fromRoute('system.theme_set_default'),
+              'query' => $query,
+              'attributes' => ['title' => $this->t('Set @theme as default theme', ['@theme' => $theme->info['name']])],
+            ];
+          }
+          $admin_theme_options[$theme->getName()] = $theme->info['name'];
+        }
+        else {
+          $theme->operations[] = [
+            'title' => $this->t('Install'),
+            'url' => Url::fromRoute('system.theme_install'),
+            'query' => $query,
+            'attributes' => ['title' => $this->t('Install @theme theme', ['@theme' => $theme->info['name']])],
+          ];
+          $theme->operations[] = [
+            'title' => $this->t('Install and set as default'),
+            'url' => Url::fromRoute('system.theme_set_default'),
+            'query' => $query,
+            'attributes' => ['title' => $this->t('Install @theme as default theme', ['@theme' => $theme->info['name']])],
+          ];
+        }
+      }
+
+      // Add notes to default and administration theme.
+      $theme->notes = [];
+      if ($theme->is_default) {
+        $theme->notes[] = $this->t('default theme');
+      }
+      if ($theme->is_admin) {
+        $theme->notes[] = $this->t('administration theme');
+      }
+
+      // Sort installed and uninstalled themes into their own groups.
+      $theme_groups[$theme->status ? 'installed' : 'uninstalled'][] = $theme;
+    }
+
+    // There are two possible theme groups.
+    $theme_group_titles = [
+      'installed' => $this->formatPlural(count($theme_groups['installed']), 'Installed theme', 'Installed themes'),
+    ];
+    if (!empty($theme_groups['uninstalled'])) {
+      $theme_group_titles['uninstalled'] = $this->formatPlural(count($theme_groups['uninstalled']), 'Uninstalled theme', 'Uninstalled themes');
+    }
+
+    uasort($theme_groups['installed'], 'system_sort_themes');
+    $this->moduleHandler()->alter('system_themes_page', $theme_groups);
+
+    $build = [];
+    $build[] = [
+      '#theme' => 'system_themes_page',
+      '#theme_groups' => $theme_groups,
+      '#theme_group_titles' => $theme_group_titles,
+    ];
+    $build[] = $this->formBuilder->getForm('Drupal\system\Form\ThemeAdminForm', $admin_theme_options);
+
+    return $build;
+  }
+
+}