[gin] Turn gin into a component

gin/public/isolate_holder.h

Index: gin/public/isolate_holder.h
diff --git a/gin/public/isolate_holder.h b/gin/public/isolate_holder.h
index 809d329e742241072d31a483c9e04955dfbc23b8..0d0654e8b876b6b132f72bd4676e44f7e0d80056 100644
--- a/gin/public/isolate_holder.h
+++ b/gin/public/isolate_holder.h
@@ -7,6 +7,7 @@
 
 #include "base/basictypes.h"
 #include "base/memory/scoped_ptr.h"
+#include "gin/gin_export.h"
 
 namespace v8 {
 class Isolate;
@@ -26,7 +27,7 @@ class PerIsolateData;
 // pass them to IsolateHolder.
 //
 // It is not possible to mix the two.
-class IsolateHolder {
+class GIN_EXPORT IsolateHolder {
  public:
   IsolateHolder();
   explicit IsolateHolder(v8::Isolate* isolate);