[gin] Turn gin into a component

gin/function_template.h.pump

Index: gin/function_template.h.pump
diff --git a/gin/function_template.h.pump b/gin/function_template.h.pump
index f9ae5ff658877ab66ebe2b278ebad368e5bb729e..fad718febc277ef1e2566fe0eb49ad5ed70c4776 100644
--- a/gin/function_template.h.pump
+++ b/gin/function_template.h.pump
@@ -18,6 +18,7 @@ $var MAX_ARITY = 4
 #include "base/logging.h"
 #include "gin/arguments.h"
 #include "gin/converter.h"
+#include "gin/gin_export.h"
 #include "gin/handle.h"
 #include "gin/public/gin_embedders.h"
 #include "gin/public/wrapper_info.h"
@@ -61,7 +62,7 @@ struct CallbackParamTraits<const T*> {
 
 // This simple base class is used so that we can share a single object template
 // among every CallbackHolder instance.
-class CallbackHolderBase : public Wrappable<CallbackHolderBase> {
+class GIN_EXPORT CallbackHolderBase : public Wrappable<CallbackHolderBase> {
  public:
   static WrapperInfo kWrapperInfo;
 
@@ -188,7 +189,7 @@ $for ARG [[    typename CallbackParamTraits<P$(ARG)>::LocalType a$(ARG);
 
 // This should be called once per-isolate to initialize the function template
 // system.
-void InitFunctionTemplates(PerIsolateData* isolate_data);
+GIN_EXPORT void InitFunctionTemplates(PerIsolateData* isolate_data);
 
 
 // CreateFunctionTemplate creates a v8::FunctionTemplate that will create