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

core/modules/comment/src/CommentLinkBuilderInterface.php

@@ -0,0 +1,32 @@
+<?php
+
+/**
+ * @file
+ * Contains \Drupal\comment\CommentLinkBuilderInterface.
+ */
+
+namespace Drupal\comment;
+
+use Drupal\Core\Entity\FieldableEntityInterface;
+
+/**
+ * Defines an interface for building comment links on a commented entity.
+ *
+ * Comment links include 'login to post new comment', 'add new comment' etc.
+ */
+interface CommentLinkBuilderInterface {
+
+  /**
+   * Builds links for the given entity.
+   *
+   * @param \Drupal\Core\Entity\FieldableEntityInterface $entity
+   *   Entity for which the links are being built.
+   * @param array $context
+   *   Array of context passed from the entity view builder.
+   *
+   * @return array
+   *   Array of entity links.
+   */
+  public function buildCommentedEntityLinks(FieldableEntityInterface $entity, array &$context);
+
+}