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

core/lib/Drupal/Core/GeneratedUrl.php

@@ -0,0 +1,49 @@
+<?php
+
+/**
+ * @file
+ * Contains \Drupal\Core\GeneratedUrl.
+ */
+
+namespace Drupal\Core;
+
+use Drupal\Core\Cache\CacheableMetadata;
+
+/**
+ * Used to return generated URLs, along with associated cacheability metadata.
+ *
+ * Note: not to be confused with \Drupal\Core\Url, which is for passing around
+ *   ungenerated URLs (typically route name + route parameters).
+ */
+class GeneratedUrl extends CacheableMetadata {
+
+  /**
+   * The string value of the URL.
+   *
+   * @var string
+   */
+  protected $generatedUrl = '';
+
+  /**
+   * Gets the generated URL.
+   *
+   * @return string
+   */
+  public function getGeneratedUrl() {
+    return $this->generatedUrl ;
+  }
+
+  /**
+   * Sets the generated URL.
+   *
+   * @param string $generated_url
+   *   The generated URL.
+   *
+   * @return $this
+   */
+  public function setGeneratedUrl($generated_url) {
+    $this->generatedUrl = $generated_url;
+    return $this;
+  }
+
+}