Merge more Kernel infrastructure from kernel_sdk SDK fork.

runtime/bin/nativewrappers.dart

Index: runtime/bin/nativewrappers.dart
diff --git a/runtime/bin/nativewrappers.dart b/runtime/bin/nativewrappers.dart
new file mode 100644
index 0000000000000000000000000000000000000000..7ed73b94d3ca022a98313c5f403adeffc317594d
--- /dev/null
+++ b/runtime/bin/nativewrappers.dart
@@ -0,0 +1,13 @@
+// Copyright (c) 2016, 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.
+
+// This library is only used by the Kernel frontend.
+// VM creates these classes in Library::InitNativeWrappersLibrary.
+
+library dart.nativewrappers;
+
+class NativeFieldWrapperClass1 extends Object {}
+class NativeFieldWrapperClass2 extends Object {}
+class NativeFieldWrapperClass3 extends Object {}
+class NativeFieldWrapperClass4 extends Object {}