[PPAPI] It is now possible to pass filesystems from JavaScript to NaCl modules.

ppapi/shared_impl/var_tracker.h

Index: ppapi/shared_impl/var_tracker.h
diff --git a/ppapi/shared_impl/var_tracker.h b/ppapi/shared_impl/var_tracker.h
index 168fcb9933335d9be36a69ddc4a83a591bdd73e8..4856766e588e0603c0609fe126585268fb283619 100644
--- a/ppapi/shared_impl/var_tracker.h
+++ b/ppapi/shared_impl/var_tracker.h
@@ -21,6 +21,10 @@
 #include "ppapi/shared_impl/ppapi_shared_export.h"
 #include "ppapi/shared_impl/var.h"
 
+namespace IPC {
+class Message;
+}  // namespace IPC
+
 namespace ppapi {
 
 class ArrayBufferVar;
@@ -85,6 +89,16 @@ class PPAPI_SHARED_EXPORT VarTracker {
   // usually immediately put this in a scoped_refptr).
   ArrayBufferVar* MakeArrayBufferVar(uint32 size_in_bytes, const void* data);
 
+  // Creates a new resource var from a resource creation message. Returns a
+  // PP_Var that references a new PP_Resource, both with an initial reference
+  // count of 1. On the host side, |creation_message| is ignored, and an empty
+  // resource var is always returned.
+  virtual PP_Var MakeResourcePPVarFromMessage(
+      PP_Instance instance,
+      const IPC::Message& creation_message,
+      int pending_renderer_id,
+      int pending_browser_id) = 0;
+
   // Creates a new resource var that points to a given resource ID. Returns a
   // PP_Var that references it and has an initial reference count of 1.
   // If |pp_resource| is 0, returns a valid, empty resource var. On the plugin