Roll Polymer from 1.5.0 -> 1.6.0 to pick up native CSS custom props

third_party/polymer/v1_0/components-chromium/polymer/polymer-micro-extracted.js

 (function () {
 function resolve() {
 document.body.removeAttribute('unresolved');
 }
 if (window.WebComponents) {
 addEventListener('WebComponentsReady', resolve);
 } else {
 if (document.readyState === 'interactive' || document.readyState === 'complete') {
 resolve();
 } else {
@@ skipping 10 matching lines @@
 }
 settings.wantShadow = settings.dom === 'shadow';
 settings.hasShadow = Boolean(Element.prototype.createShadowRoot);
 settings.nativeShadow = settings.hasShadow && !window.ShadowDOMPolyfill;
 settings.useShadow = settings.wantShadow && settings.hasShadow;
 settings.hasNativeImports = Boolean('import' in document.createElement('link'));
 settings.useNativeImports = settings.hasNativeImports;
 settings.useNativeCustomElements = !window.CustomElements || window.CustomElements.useNative;
 settings.useNativeShadow = settings.useShadow && settings.nativeShadow;
 settings.usePolyfillProto = !settings.useNativeCustomElements && !Object.__proto__;
+settings.hasNativeCSSProperties = !navigator.userAgent.match('AppleWebKit/601') && window.CSS && CSS.supports && CSS.supports('box-shadow', '0 0 0 var(--foo)');
+settings.useNativeCSSProperties = settings.hasNativeCSSProperties && settings.lazyRegister && settings.useNativeCSSProperties;
 return settings;
 }()
 };(function () {
 var userPolymer = window.Polymer;
 window.Polymer = function (prototype) {
 if (typeof prototype === 'function') {
 prototype = prototype.prototype;
 }
 if (!prototype) {
 prototype = {};
@@ skipping 67 matching lines @@
 _afterNextRenderQueue: [],
 _waitingNextRender: false,
 afterNextRender: function (element, fn, args) {
 this._watchNextRender();
 this._afterNextRenderQueue.push([
 element,
 fn,
 args
 ]);
 },
+hasRendered: function () {
+return this._ready;
+},
 _watchNextRender: function () {
 if (!this._waitingNextRender) {
 this._waitingNextRender = true;
 var fn = function () {
 Polymer.RenderStatus._flushNextRender();
 };
 if (!this._ready) {
 this.whenReady(fn);
 } else {
 requestAnimationFrame(fn);
@@ skipping 531 matching lines @@
 try {
 return JSON.stringify(value);
 } catch (x) {
 return '';
 }
 }
 default:
 return value != null ? value : undefined;
 }
 }
-});Polymer.version = "1.5.0";Polymer.Base._addFeature({
+});Polymer.version = '1.6.0';Polymer.Base._addFeature({
 _registerFeatures: function () {
 this._prepIs();
 this._prepBehaviors();
 this._prepConstructor();
 this._prepPropertyInfo();
 },
 _prepBehavior: function (b) {
 this._addHostAttributes(b.hostAttributes);
 },
 _marshalBehavior: function (b) {
 },
 _initFeatures: function () {
 this._marshalHostAttributes();
 this._marshalBehaviors();
 }
 });