[gin] Turn gin into a component

gin/public/wrapper_info.h

 // 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_PUBLIC_WRAPPER_INFO_H_
 #define GIN_PUBLIC_WRAPPER_INFO_H_
 
+#include "gin/gin_export.h"
 #include "gin/public/gin_embedders.h"
 #include "v8/include/v8.h"
 
 namespace gin {
 
 // Gin embedder that use their own WrapperInfo-like structs must ensure that
 // the first field is of type GinEmbedderId and has the correct id set. They
 // also should use kWrapperInfoIndex to start their WrapperInfo-like struct
 // and ensure that all objects have kNumberOfInternalFields internal fields.
 
 enum InternalFields {
   kWrapperInfoIndex,
   kEncodedValueIndex,
   kNumberOfInternalFields,
 };
 
-struct WrapperInfo {
+struct GIN_EXPORT WrapperInfo {
   static WrapperInfo* From(v8::Handle<v8::Object> object);
   const GinEmbedder embedder;
 };
 
 }  // namespace gin
 
 #endif  // GIN_PUBLIC_WRAPPER_INFO_H_