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diff --git a/catapult/third_party/polymer/components/shadycss/src/common-utils.js b/catapult/third_party/polymer/components/shadycss/src/common-utils.js
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+/**
+@license
+Copyright (c) 2017 The Polymer Project Authors. All rights reserved.
+This code may only be used under the BSD style license found at http://polymer.github.io/LICENSE.txt
+The complete set of authors may be found at http://polymer.github.io/AUTHORS.txt
+The complete set of contributors may be found at http://polymer.github.io/CONTRIBUTORS.txt
+Code distributed by Google as part of the polymer project is also
+subject to an additional IP rights grant found at http://polymer.github.io/PATENTS.txt
+*/
+
+'use strict';
+
+import { MIXIN_MATCH, VAR_ASSIGN } from './common-regex.js';
+
+/**
+ * @param {Element} element
+ * @param {Object=} properties
+ */
+export function updateNativeProperties(element, properties) {
+  // remove previous properties
+  for (let p in properties) {
+    // NOTE: for bc with shim, don't apply null values.
+    if (p === null) {
+      element.style.removeProperty(p);
+    } else {
+      element.style.setProperty(p, properties[p]);
+    }
+  }
+}
+
+/**
+ * @param {Element} element
+ * @param {string} property
+ * @return {string}
+ */
+export function getComputedStyleValue(element, property) {
+  /**
+   * @const {string}
+   */
+  const value = window.getComputedStyle(element).getPropertyValue(property);
+  if (!value) {
+    return '';
+  } else {
+    return value.trim();
+  }
+}
+
+/**
+ * return true if `cssText` contains a mixin definition or consumption
+ * @param {string} cssText
+ * @return {boolean}
+ */
+export function detectMixin(cssText) {
+  const has = MIXIN_MATCH.test(cssText) || VAR_ASSIGN.test(cssText);
+  // reset state of the regexes
+  MIXIN_MATCH.lastIndex = 0;
+  VAR_ASSIGN.lastIndex = 0;
+  return has;
+}