[NaCl SDK] nacl_io: Replace allocated ino with hash of path.

native_client_sdk/src/libraries/nacl_io/filesystem.h

Index: native_client_sdk/src/libraries/nacl_io/filesystem.h
diff --git a/native_client_sdk/src/libraries/nacl_io/filesystem.h b/native_client_sdk/src/libraries/nacl_io/filesystem.h
index 862c527ece6344b0115b7425ad2819730baae979..e6b7ba2aa1e31b958a5662afb8768cacbaab68ba 100644
--- a/native_client_sdk/src/libraries/nacl_io/filesystem.h
+++ b/native_client_sdk/src/libraries/nacl_io/filesystem.h
@@ -95,10 +95,10 @@ class Filesystem : public sdk_util::RefObject {
   Error Filesystem_Ioctl(int request, ...);
 
   // Assumes that |node| is non-NULL.
-  void OnNodeCreated(Node* node);
+  virtual void OnNodeCreated(Node* node);
 
   // Assumes that |node| is non-NULL.
-  void OnNodeDestroyed(Node* node);
+  virtual void OnNodeDestroyed(Node* node);
 
  protected:
   // Device number for the filesystem.