fix #27775, enum declaration where "name" is a property

pkg/dev_compiler/lib/js/es6/dart_sdk.js

Index: pkg/dev_compiler/lib/js/es6/dart_sdk.js
diff --git a/pkg/dev_compiler/lib/js/es6/dart_sdk.js b/pkg/dev_compiler/lib/js/es6/dart_sdk.js
index 8bb83dbdc1a6e9f8c097ef8a342770448f651335..44083b71c66cc5faf7f145bbdd4e9b83a6df8176 100644
--- a/pkg/dev_compiler/lib/js/es6/dart_sdk.js
+++ b/pkg/dev_compiler/lib/js/es6/dart_sdk.js
@@ -1072,6 +1072,15 @@ dart.defineNamedConstructorCallable = function(clazz, name, ctor) {
   ctor.prototype = clazz.prototype;
   dart.defineProperty(clazz, name, {value: ctor, configurable: true});
 };
+dart.defineEnumValues = function(enumClass, names) {
+  let values = [];
+  for (var i = 0; i < names.length; i++) {
+    let value = dart.const(new enumClass(i));
+    values.push(value);
+    Object.defineProperty(enumClass, names[i], {value: value, configurable: true});
+  }
+  enumClass.values = dart.constList(values, enumClass);
+};
 dart.fn = function(closure, t) {
   if (t == null) {
     t = dart.definiteFunctionType(dart.dynamic, Array(closure.length).fill(dart.dynamic), void 0);