[third_party] add polymer 1.2.3

polymer_1.2.3/promise-polyfill/Promise-Statics.js

 Promise.all = Promise.all || function () {
   var args = Array.prototype.slice.call(arguments.length === 1 && Array.isArray(arguments[0]) ? arguments[0] : arguments);
 
   return new Promise(function (resolve, reject) {
     if (args.length === 0) return resolve([]);
     var remaining = args.length;
     function res(i, val) {
       try {
         if (val && (typeof val === 'object' || typeof val === 'function')) {
           var then = val.then;
@@ skipping 17 matching lines @@
 };
 
 Promise.race = Promise.race || function (values) {
   return new Promise(function (resolve, reject) {
     for(var i = 0, len = values.length; i < len; i++) {
       values[i].then(resolve, reject);
     }
   });
 };