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

core/modules/breakpoint/src/BreakpointManagerInterface.php

@@ -0,0 +1,46 @@
+<?php
+
+/**
+ * @file
+ * Contains \Drupal\breakpoint\BreakpointManagerInterface.
+ */
+
+namespace Drupal\breakpoint;
+
+/**
+ * Defines an interface for breakpoint managers.
+ */
+interface BreakpointManagerInterface {
+
+  /**
+   * Gets breakpoints for the specified group.
+   *
+   * @param string $group
+   *   The breakpoint group to retrieve.
+   *
+   * @return \Drupal\breakpoint\BreakpointInterface[]
+   *   Array of breakpoint plugins keyed by machine name.
+   */
+  public function getBreakpointsByGroup($group);
+
+  /**
+   * Gets all the existing breakpoint groups.
+   *
+   * @return array
+   *   Array of breakpoint group labels. Keyed by group name.
+   */
+  public function getGroups();
+
+  /**
+   * Gets all the providers for the specified breakpoint group.
+   *
+   * @param string $group
+   *   The breakpoint group to retrieve.
+   *
+   * @return array
+   *   An array keyed by provider name with values of provider type (module or
+   *   theme).
+   */
+  public function getGroupProviders($group);
+
+}