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

third_party/polymer/v1_0/chromium.patch

Index: third_party/polymer/v1_0/chromium.patch
diff --git a/third_party/polymer/v1_0/chromium.patch b/third_party/polymer/v1_0/chromium.patch
index abea3534fe32cb8ef469aeda22264184d2589a27..9de17adf4442269b0b572939ed648fb6b932f48b 100644
--- a/third_party/polymer/v1_0/chromium.patch
+++ b/third_party/polymer/v1_0/chromium.patch
@@ -24,26 +24,15 @@ index baf9ab3..985fe6c 100644
  removeCustomPropAssignment: function (cssText) {
  return cssText.replace(this._rx.customProp, '').replace(this._rx.mixinProp, '');
 diff --git a/components-chromium/polymer/polymer-extracted.js b/components-chromium/polymer/polymer-extracted.js
-index 8446e8a..3f679f6 100644
+index 627bdd3..7ba497c 100644
 --- a/components-chromium/polymer/polymer-extracted.js
 +++ b/components-chromium/polymer/polymer-extracted.js
-@@ -2475,7 +2475,7 @@ AT_START: '@'
- }();
- Polymer.StyleUtil = function () {
+@@ -2521,7 +2521,7 @@ AT_START: '@'
+ var settings = Polymer.Settings;
  return {
+ NATIVE_VARIABLES: Polymer.Settings.useNativeCSSProperties,
 -MODULE_STYLES_SELECTOR: 'style, link[rel=import][type~=css], template',
 +MODULE_STYLES_SELECTOR: 'style:not([no-process]), link[rel=import][type~=css], template',
  INCLUDE_ATTR: 'include',
- toCssText: function (rules, callback, preserveProperties) {
+ toCssText: function (rules, callback) {
  if (typeof rules === 'string') {
---- a/components-chromium/iron-collapse/iron-collapse-extracted.js
-+++ b/components-chromium/iron-collapse/iron-collapse-extracted.js
-@@ -96,7 +96,7 @@ Polymer({
- 
-     /**
-      * Updates the size of the element.
--     * @param {!String} size The new value for `maxWidth`/`maxHeight` as css property value, usually `auto` or `0px`.
-+     * @param {string} size The new value for `maxWidth`/`maxHeight` as css property value, usually `auto` or `0px`.
-      * @param {boolean=} animated if `true` updates the size with an animation, otherwise without.
-      */     
-     updateSize: function(size, animated) {