Refactor FileSystem

ppapi/shared_impl/ppb_file_ref_shared.h

Index: ppapi/shared_impl/ppb_file_ref_shared.h
diff --git a/ppapi/shared_impl/ppb_file_ref_shared.h b/ppapi/shared_impl/ppb_file_ref_shared.h
index 5decd7f858367921062f70d13df46bf7b80e8587..a35a35fc069b54d48d8e2d727225daa440ca298a 100644
--- a/ppapi/shared_impl/ppb_file_ref_shared.h
+++ b/ppapi/shared_impl/ppb_file_ref_shared.h
@@ -24,6 +24,11 @@ struct PPB_FileRef_CreateInfo {
   int file_system_type;  // One of PP_FileSystemType values.
   std::string path;
   std::string name;
+
+  // Since FileRef needs to hold a FileSystem reference, we need to pass the
+  // resource in this CreateInfo.  Note that this is a plugin resource as
+  // FileSystem is already in new design.
+  PP_Resource file_system_plugin_resource;
 };
 
 // This class provides the shared implementation of a FileRef. The functions