Add the c++ code part of bindings2/

sky/engine/bindings2/builtin.h

Index: sky/engine/bindings2/builtin.h
diff --git a/sky/engine/bindings2/builtin.h b/sky/engine/bindings2/builtin.h
new file mode 100644
index 0000000000000000000000000000000000000000..0a1b616fc4627388a721e53673ddbd9b4657526a
--- /dev/null
+++ b/sky/engine/bindings2/builtin.h
@@ -0,0 +1,34 @@
+// 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.
+
+#ifndef SKY_ENGINE_BINDINGS2_BUILTIN_H_
+#define SKY_ENGINE_BINDINGS2_BUILTIN_H_
+
+#include "base/macros.h"
+#include "dart/runtime/include/dart_api.h"
+
+namespace blink {
+
+class Builtin {
+ public:
+  // Note: Changes to this enum should be accompanied with changes to
+  // the builtin_libraries_ array in builtin.cc.
+  enum BuiltinLibraryId {
+    kBuiltinLibrary,
+    kSkyLibrary,
+    kMojoBindingsLibrary,
+    kMojoCoreLibrary,
+    kInvalidLibrary,
+  };
+
+  static void SetNativeResolver(BuiltinLibraryId id);
+  static Dart_Handle LoadAndCheckLibrary(BuiltinLibraryId id);
+
+ private:
+  DISALLOW_IMPLICIT_CONSTRUCTORS(Builtin);
+};
+
+}  // namespace blink
+
+#endif  // SKY_ENGINE_BINDINGS2_BUILTIN_H_