Update to Drupal 8.1.0. For more information, see https://www.drupal.org/drupal-8.1.0-release-notes

core/modules/help/src/HelpSectionManager.php

@@ -0,0 +1,37 @@
+<?php
+
+namespace Drupal\help;
+
+use Drupal\Core\Cache\CacheBackendInterface;
+use Drupal\Core\Extension\ModuleHandlerInterface;
+use Drupal\Core\Plugin\DefaultPluginManager;
+
+/**
+ * Manages help page section plugins.
+ *
+ * @see \Drupal\help\HelpSectionPluginInterface
+ * @see \Drupal\help\Plugin\HelpSection\HelpSectionPluginBase
+ * @see \Drupal\help\Annotation\HelpSection
+ * @see hook_help_section_info_alter()
+ */
+class HelpSectionManager extends DefaultPluginManager {
+
+  /**
+   * Constructs a new HelpSectionManager.
+   *
+   * @param \Traversable $namespaces
+   *   An object that implements \Traversable which contains the root paths
+   *   keyed by the corresponding namespace to look for plugin implementations.
+   * @param \Drupal\Core\Cache\CacheBackendInterface $cache_backend
+   *   Cache backend instance to use.
+   * @param \Drupal\Core\Extension\ModuleHandlerInterface $module_handler
+   *   The module handler for the alter hook.
+   */
+  public function __construct(\Traversable $namespaces, CacheBackendInterface $cache_backend, ModuleHandlerInterface $module_handler) {
+    parent::__construct('Plugin/HelpSection', $namespaces, $module_handler, 'Drupal\help\HelpSectionPluginInterface', 'Drupal\help\Annotation\HelpSection');
+
+    $this->alterInfo('help_section_info');
+    $this->setCacheBackend($cache_backend, 'help_section_plugins');
+  }
+
+}