From dd57ddbef6c1ddcc5429daa6b4b334da9635708b Mon Sep 17 00:00:00 2001
From: Andrey <andrey-git@users.noreply.github.com>
Date: Sun, 27 May 2018 18:56:01 +0300
Subject: [PATCH] Try to use existing updateStyles for theming (#1217)

---
 src/common/dom/apply_themes_on_element.js | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/src/common/dom/apply_themes_on_element.js b/src/common/dom/apply_themes_on_element.js
index 267b9bafd8..a21ac4ed82 100644
--- a/src/common/dom/apply_themes_on_element.js
+++ b/src/common/dom/apply_themes_on_element.js
@@ -23,8 +23,10 @@ export default function applyThemesOnElement(element, themes, localTheme, update
       styles[prefixedKey] = theme[key];
     });
   }
-  // implement updateStyles() method of Polemer elements
-  if (window.ShadyCSS) {
+  if (element.updateStyles) {
+    element.updateStyles(styles);
+  } else if (window.ShadyCSS) {
+    // implement updateStyles() method of Polemer elements
     window.ShadyCSS.styleSubtree(/** @type {!HTMLElement} */(element), styles);
   }