Merge branch 'object-assign-ie11'

app-localize-behavior.html

@@ -13,6 +13,19 @@
 <script src="../intl-messageformat/dist/intl-messageformat.min.js"></script>
 
 <script>
+(function() {
+
+// This isn't a complete `Object.assign` polyfill, but this element expects
+// JSON and doesn't provide more than one source object.
+var assign = Object.assign ? Object.assign.bind(Object) : function(destination, source) {
+  for (var prop in source) {
+    if (source.hasOwnProperty(prop)) {
+      destination[prop] = source[prop];
+    }
+  }
+
+  return destination;
+};
 
 /**
 * `Polymer.AppLocalizeBehavior` wraps the [format.js](http://formatjs.io/) library to
@@ -292,11 +305,11 @@
     var newResources = event.response;
     if (merge) {
       if (language) {
-        propertyUpdates.resources = Object.assign({}, this.resources || {});
-        propertyUpdates['resources.' + language] = Object.assign(
+        propertyUpdates.resources = assign({}, this.resources || {});
+        propertyUpdates['resources.' + language] = assign(
           propertyUpdates.resources[language] || {}, newResources);
       } else {
-        propertyUpdates.resources = Object.assign(this.resources, newResources);
+        propertyUpdates.resources = assign(this.resources, newResources);
       }
     } else {
       if (language) {
@@ -330,6 +343,7 @@
       proto['__localizationCache'] = {requests: {}, messages: {}, ajax: null};
     }
   }
-}
+};
 
+})();
 </script>