[gin] Turn gin into a component

gin/public/wrapper_info.h

Index: gin/public/wrapper_info.h
diff --git a/gin/public/wrapper_info.h b/gin/public/wrapper_info.h
index fe047c0ccd3cc2c7733567675343b9bc08d37d37..31b2a981e3cb411bd233f83d37324fa479719c8f 100644
--- a/gin/public/wrapper_info.h
+++ b/gin/public/wrapper_info.h
@@ -5,6 +5,7 @@
 #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"
 
@@ -21,7 +22,7 @@ enum InternalFields {
   kNumberOfInternalFields,
 };
 
-struct WrapperInfo {
+struct GIN_EXPORT WrapperInfo {
   static WrapperInfo* From(v8::Handle<v8::Object> object);
   const GinEmbedder embedder;
 };