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

core/modules/taxonomy/src/TermViewBuilder.php

@@ -0,0 +1,30 @@
+<?php
+
+/**
+ * @file
+ * Contains \Drupal\taxonomy\TermViewBuilder.
+ */
+
+namespace Drupal\taxonomy;
+
+use Drupal\Core\Entity\Display\EntityViewDisplayInterface;
+use Drupal\Core\Entity\EntityInterface;
+use Drupal\Core\Entity\EntityViewBuilder;
+
+/**
+ * Render controller for taxonomy terms.
+ */
+class TermViewBuilder extends EntityViewBuilder {
+
+  /**
+   * {@inheritdoc}
+   */
+  protected function alterBuild(array &$build, EntityInterface $entity, EntityViewDisplayInterface $display, $view_mode, $langcode = NULL) {
+    parent::alterBuild($build, $entity, $display, $view_mode, $langcode);
+    $build['#contextual_links']['taxonomy_term'] = array(
+      'route_parameters' => array('taxonomy_term' => $entity->id()),
+      'metadata' => array('changed' => $entity->getChangedTime()),
+    );
+  }
+
+}