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

tests/compiler/dart2js_native/browser_compat_2_test.dart

 // Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
+import "dart:_js_helper";
 import "package:expect/expect.dart";
 
 // Test for dartNativeDispatchHooksTransformer
 //  - uncached, instance, leaf and interior caching modes.
 //  - composition of getTag.
 
-class T1A native "T1A" {
+@Native("T1A")
+class T1A {
   foo() native;
 }
 
-class T1B native "T1B" {
+@Native("T1B")
+class T1B {
   foo() native;
 }
 
-class T1C native "T1C" {
+@Native("T1C")
+class T1C {
   foo() native;
 }
 
-class T1D native "T1D" {
+@Native("T1D")
+class T1D {
   foo() native;
 }
 
 makeT1A() native;
 makeT1B() native;
 makeT1C() native;
 makeT1D() native;
 
 int getTagCallCount() native;
 void clearTagCallCount() native;
@@ skipping 99 matching lines @@
       '2 = 1 fresh instance + 1 uncached (+ 2 proto cached)');
 
   clearTagCallCount();
   Expect.equals("aA", inscrutable(t1a).foo(), 't1a is T1A');
   Expect.equals("bB", inscrutable(t1b).foo(), 't1b is T1B');
   Expect.equals("cC", inscrutable(t1c).foo(), 't1c is T1C');
   Expect.equals("dD", inscrutable(t1d).foo(), 't1d is T1D');
   Expect.equals(1, getTagCallCount(),
       '1 = 2 proto cached + 1 instance cached + 1 uncached');
 }