From 41df9a591b0065979716ee11c9ed5e8fb52d4d30 Mon Sep 17 00:00:00 2001
From: Steven Orvell <sorvell@google.com>
Date: Thu, 19 Dec 2019 16:55:05 -0800
Subject: [PATCH] Update externs.

---
 externs/webcomponents-externs.js | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/externs/webcomponents-externs.js b/externs/webcomponents-externs.js
index 9698b01b79..b773a92834 100644
--- a/externs/webcomponents-externs.js
+++ b/externs/webcomponents-externs.js
@@ -1,6 +1,7 @@
 /**
  * @fileoverview Externs for webcomponents polyfills
  * @externs
+ * @suppress {duplicate}
  *
  * @license
  * Copyright (c) 2017 The Polymer Project Authors. All rights reserved.
@@ -15,11 +16,12 @@
 var HTMLImports = {};
 
 /**
- * @param {function()} callback
+ * @param {function()=} callback
  */
 HTMLImports.whenReady = function(callback) {};
 
 /**
+ * Returns the import document containing the element.
  * @param {!Node} element
  * @return {?HTMLLinkElement|?Document|undefined}
  */