Added base template for config ui.

appengine/config_service/ui/bower_components/shadycss/src/style-settings.js

+/**
+@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';
+
+export let nativeShadow = !(window['ShadyDOM'] && window['ShadyDOM']['inUse']);
+export let nativeCssVariables;
+
+/**
+ * @param {(ShadyCSSOptions | ShadyCSSInterface)=} settings
+ */
+function calcCssVariables(settings) {
+  if (settings && settings['shimcssproperties']) {
+    nativeCssVariables = false;
+  } else {
+    // chrome 49 has semi-working css vars, check if box-shadow works
+    // safari 9.1 has a recalc bug: https://bugs.webkit.org/show_bug.cgi?id=155782
+    // However, shim css custom properties are only supported with ShadyDOM enabled,
+    // so fall back on native if we do not detect ShadyDOM
+    nativeCssVariables = nativeShadow || Boolean(!navigator.userAgent.match('AppleWebKit/601') &&
+      window.CSS && CSS.supports && CSS.supports('box-shadow', '0 0 0 var(--foo)'));
+  }
+}
+
+if (window.ShadyCSS && window.ShadyCSS.nativeCss !== undefined) {
+  nativeCssVariables = window.ShadyCSS.nativeCss;
+} else if (window.ShadyCSS) {
+  calcCssVariables(window.ShadyCSS);
+  // reset window variable to let ShadyCSS API take its place
+  window.ShadyCSS = undefined;
+} else {
+  calcCssVariables(window['WebComponents'] && window['WebComponents']['flags']);
+}