Add @Native(...) annotation for native class names.

tests/compiler/dart2js_native/native_method_rename1_frog_test.dart

Index: tests/compiler/dart2js_native/native_method_rename1_frog_test.dart
diff --git a/tests/compiler/dart2js_native/native_method_rename1_frog_test.dart b/tests/compiler/dart2js_native/native_method_rename1_frog_test.dart
index 286e58810ae5ed6e7dd79afcbfaa4d97d0c285d2..22e2eaccf3a9c866a35ad4474a93e7d18f2d6f04 100644
--- a/tests/compiler/dart2js_native/native_method_rename1_frog_test.dart
+++ b/tests/compiler/dart2js_native/native_method_rename1_frog_test.dart
@@ -5,9 +5,10 @@
 // Test the feature where the native string declares the native method's name.
 
 import "package:expect/expect.dart";
-import 'dart:_js_helper' show JSName;
+import 'dart:_js_helper' show Native, JSName;
 
-class A native "A" {
+@Native("A")
+class A {
   @JSName('fooA')
   int foo() native;