Add the c++ code part of bindings2/

sky/engine/bindings2/snapshot.dart

Index: sky/engine/bindings2/snapshot.dart
diff --git a/mojo/dart/embedder/test/test_snapshot.dart b/sky/engine/bindings2/snapshot.dart
similarity index 76%
copy from mojo/dart/embedder/test/test_snapshot.dart
copy to sky/engine/bindings2/snapshot.dart
index b643b289d89754770091d6539f16c2d1401f5260..de3d83adc0b5628b25c5a659653f68d3b2748630 100644
--- a/mojo/dart/embedder/test/test_snapshot.dart
+++ b/sky/engine/bindings2/snapshot.dart
@@ -1,15 +1,16 @@
-// Copyright 2014 The Chromium Authors. All rights reserved.
+// Copyright 2015 The Chromium Authors. 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:async';
-import 'dart:core';
 import 'dart:collection';
 import 'dart:convert';
+import 'dart:core';
 import 'dart:isolate';
 import 'dart:math';
 import 'dart:mirrors';
 import 'dart:mojo_bindings';
-import 'dart:mojo_builtin';
 import 'dart:mojo_core';
+import 'dart:sky';
+import 'dart:sky_builtin';
 import 'dart:typed_data';