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

native_client_sdk/src/libraries/nacl_io/stream/stream_fs.cc

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "nacl_io/stream/stream_fs.h"
 
 #include <errno.h>
 
 #include "nacl_io/ossocket.h"
 #include "nacl_io/pepper_interface.h"
@@ skipping 66 matching lines @@
 }
 
 StreamFs::~StreamFs() {
   if (message_loop_) {
     ppapi_->GetMessageLoopInterface()->PostQuit(message_loop_, PP_TRUE);
     ppapi_->ReleaseResource(message_loop_);
   }
   pthread_cond_destroy(&message_cond_);
 }
 
-Error StreamFs::Open(const Path& path, int o_flags, ScopedNode* out_node) {
+Error StreamFs::OpenWithMode(const Path& path, int o_flags, mode_t mode,
+                             ScopedNode* out_node) {
   return EACCES;
 }
 
 Error StreamFs::Unlink(const Path& path) {
   return EACCES;
 }
 
 Error StreamFs::Mkdir(const Path& path, int permissions) {
   return EACCES;
 }
 
 Error StreamFs::Rmdir(const Path& path) {
   return EACCES;
 }
 
 Error StreamFs::Remove(const Path& path) {
   return EACCES;
 }
 
 Error StreamFs::Rename(const Path& path, const Path& newpath) {
   return EACCES;
 }
 
 }  // namespace nacl_io