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

native_client_sdk/src/libraries/nacl_io/html5fs/html5_fs.h

 // 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.
 
 #ifndef LIBRARIES_NACL_IO_HTML5FS_HTML5_FS_H_
 #define LIBRARIES_NACL_IO_HTML5FS_HTML5_FS_H_
 
 #include <pthread.h>
 
 #include "nacl_io/filesystem.h"
 #include "nacl_io/pepper_interface.h"
 #include "nacl_io/typed_fs_factory.h"
 #include "sdk_util/simple_lock.h"
 
 namespace nacl_io {
 
 class Node;
 
 class Html5Fs : public Filesystem {
  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 permissions);
   virtual Error Rmdir(const Path& path);
   virtual Error Remove(const Path& path);
   virtual Error Rename(const Path& path, const Path& newpath);
 
   PP_Resource filesystem_resource() { return filesystem_resource_; }
 
  protected:
   static const int REMOVE_DIR = 1;
@@ skipping 25 matching lines @@
   pthread_cond_t filesystem_open_cond_;
   sdk_util::SimpleLock filesysem_open_lock_;
   std::string prefix_;
 
   friend class TypedFsFactory<Html5Fs>;
 };
 
 }  // namespace nacl_io
 
 #endif  // LIBRARIES_NACL_IO_HTML5FS_HTML5_FS_H_