Add test for Frog native class with same native name as interface.

tests/language/src/NativeLibrarySameNameUsedLib2.dart

Index: tests/language/src/NativeLibrarySameNameUsedLib2.dart
diff --git a/tests/language/src/NativeLibrarySameNameUsedLib2.dart b/tests/language/src/NativeLibrarySameNameUsedLib2.dart
new file mode 100644
index 0000000000000000000000000000000000000000..6b77dc38316ebe3d882ebcd0399d57a9fcd79194
--- /dev/null
+++ b/tests/language/src/NativeLibrarySameNameUsedLib2.dart
@@ -0,0 +1,14 @@
+// Copyright (c) 2011, 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.
+
+// Native implementation.
+
+#library('lib2');
+#import('NativeLibrarySameNameUsedLib1.dart');  // To get interface I.
+
+// Native impl has same name as interface.
+class Impl implements I native "*I" {
+  Impl read() native;
+  write(Impl x) native;
+}