Drupal 8.0.0 beta 12. More info: https://www.drupal.org/node/2514176

core/modules/taxonomy/src/TaxonomyPermissions.php

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+<?php
+
+/**
+ * @file
+ * Contains \Drupal\taxonomy\TaxonomyPermissions.
+ */
+
+namespace Drupal\taxonomy;
+
+use Drupal\Core\DependencyInjection\ContainerInjectionInterface;
+use Drupal\Core\Entity\EntityManagerInterface;
+use Drupal\Core\StringTranslation\StringTranslationTrait;
+use Symfony\Component\DependencyInjection\ContainerInterface;
+
+/**
+ * Provides dynamic permissions of the taxonomy module.
+ *
+ * @see taxonomy.permissions.yml
+ */
+class TaxonomyPermissions implements ContainerInjectionInterface {
+
+  use StringTranslationTrait;
+
+  /**
+   * The entity manager.
+   *
+   * @var \Drupal\Core\Entity\EntityManagerInterface
+   */
+  protected $entityManager;
+
+  /**
+   * Constructs a TaxonomyPermissions instance.
+   *
+   * @param \Drupal\Core\Entity\EntityManagerInterface $entity_manager
+   *   The entity manager.
+   */
+  public function __construct(EntityManagerInterface $entity_manager) {
+    $this->entityManager = $entity_manager;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public static function create(ContainerInterface $container) {
+    return new static($container->get('entity.manager'));
+  }
+
+  /**
+   * Get taxonomy permissions.
+   *
+   * @return array
+   *   Permissions array.
+   */
+  public function permissions() {
+    $permissions = [];
+    foreach ($this->entityManager->getStorage('taxonomy_vocabulary')->loadMultiple() as $vocabulary) {
+      $permissions += [
+        'edit terms in ' . $vocabulary->id() => [
+          'title' => $this->t('Edit terms in %vocabulary', ['%vocabulary' => $vocabulary->label()]),
+        ],
+      ];
+      $permissions += [
+        'delete terms in ' . $vocabulary->id() => [
+          'title' => $this->t('Delete terms from %vocabulary', ['%vocabulary' => $vocabulary->label()]),
+        ],
+      ];
+    }
+    return $permissions;
+  }
+
+}