Add gin, a lightweight bindings system for V8

gin/wrapper_info.cc

Index: gin/wrapper_info.cc
diff --git a/gin/wrapper_info.cc b/gin/wrapper_info.cc
new file mode 100644
index 0000000000000000000000000000000000000000..d14156dcb269722659c69f332dcf8d305c0da480
--- /dev/null
+++ b/gin/wrapper_info.cc
@@ -0,0 +1,16 @@
+// 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.
+
+#include "gin/wrapper_info.h"
+
+namespace gin {
+
+WrapperInfo* WrapperInfo::From(v8::Handle<v8::Object> object) {
+  if (object->InternalFieldCount() != kNumberOfInternalFields)
+    return NULL;
+  return static_cast<WrapperInfo*>(
+      object->GetAlignedPointerFromInternalField(kWrapperInfoIndex));
+}
+
+}  // namespace gin