Plumbing though mode parameter to open, since fusefs can make use of it.

native_client_sdk/src/libraries/nacl_io/fusefs/fuse_fs.h

Index: native_client_sdk/src/libraries/nacl_io/fusefs/fuse_fs.h
diff --git a/native_client_sdk/src/libraries/nacl_io/fusefs/fuse_fs.h b/native_client_sdk/src/libraries/nacl_io/fusefs/fuse_fs.h
index 1673b0881f2fbafce20a4b12537eb6b65660e505..3ddc289845a98ba1bae3b008d67489053aee2a8a 100644
--- a/native_client_sdk/src/libraries/nacl_io/fusefs/fuse_fs.h
+++ b/native_client_sdk/src/libraries/nacl_io/fusefs/fuse_fs.h
@@ -21,7 +21,8 @@ class FuseFs : public Filesystem {
   virtual void Destroy();
 
  public:
-  virtual Error Open(const Path& path, int mode, ScopedNode* out_node);
+  virtual Error OpenWithMode(const Path& path, int open_flags, mode_t mode,
+                             ScopedNode* out_node);
   virtual Error Unlink(const Path& path);
   virtual Error Mkdir(const Path& path, int perm);
   virtual Error Rmdir(const Path& path);