Add gin, a lightweight bindings system for V8

gin/wrapper_info.h

Index: gin/wrapper_info.h
diff --git a/gin/wrapper_info.h b/gin/wrapper_info.h
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+// Copyright 2013 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 GIN_WRAPPER_INFO_H_
+#define GIN_WRAPPER_INFO_H_
+
+#include "v8/include/v8.h"
+
+namespace gin {
+
+enum InternalFields {
+  kWrapperInfoIndex,
+  kEncodedValueIndex,
+  kNumberOfInternalFields,
+};
+
+struct WrapperInfo {
+  static WrapperInfo* From(v8::Handle<v8::Object> object);
+  // Currently we just use the address of this struct for identity.
+};
+
+}  // namespace gin
+
+#endif  // GIN_WRAPPER_INFO_H_