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

tests/language/src/NativeLibrarySameNameUsedLib1.dart

Index: tests/language/src/NativeLibrarySameNameUsedLib1.dart
diff --git a/tests/language/src/NativeLibrarySameNameUsedLib1.dart b/tests/language/src/NativeLibrarySameNameUsedLib1.dart
new file mode 100644
index 0000000000000000000000000000000000000000..531270daead5c740c40167936485bc471bea8b56
--- /dev/null
+++ b/tests/language/src/NativeLibrarySameNameUsedLib1.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.
+
+// 'I' is the name of an interface and the name of the native class.
+
+#import('NativeLibrarySameNameUsedLib2.dart');
+
+interface I {
+  I read();
+  write(I x);
+}
+
+makeI() native { new Impl(); }  // Hint Impl is created by makeI.