Upgrade to 1.0 and switch clients to dom-repeat where needed.

third_party/polymer/v0_8/components/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;
+          if (typeof then === 'function') {
+            then.call(val, function (val) { res(i, val) }, reject);
+            return;
+          }
+        }
+        args[i] = val;
+        if (--remaining === 0) {
+          resolve(args);
+        }
+      } catch (ex) {
+        reject(ex);
+      }
+    }
+    for (var i = 0; i < args.length; i++) {
+      res(i, args[i]);
+    }
+  });
+};
+
+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);
+    }
+  });
+};
+