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

tests/compiler/dart2js_native/issue9182_test.dart

Index: tests/compiler/dart2js_native/issue9182_test.dart
diff --git a/tests/compiler/dart2js_native/issue9182_test.dart b/tests/compiler/dart2js_native/issue9182_test.dart
index 8d2734b01821e7cef73bdf6a55c184a5718bf497..8bbee654c923a6b6630d1e6b895dc60af63586f8 100644
--- a/tests/compiler/dart2js_native/issue9182_test.dart
+++ b/tests/compiler/dart2js_native/issue9182_test.dart
@@ -5,9 +5,11 @@
 // Regression test for Issue 9182.  The generative constructor body function
 // should not have the interceptor calling convention.
 
+import "dart:_js_helper";
 import "package:expect/expect.dart";
 
-class Foo native "A" {
+@Native("A")
+class Foo {
   factory Foo() => makeA();
   // Ensure the instance method 'Bar' uses interceptor convention.
   Bar() => 123;