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

native_client_sdk/src/libraries/nacl_io/httpfs/http_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_HTTPFS_HTTP_FS_H_
 #define LIBRARIES_NACL_IO_HTTPFS_HTTP_FS_H_
 
 #include <string>
 #include "nacl_io/filesystem.h"
 #include "nacl_io/pepper_interface.h"
 #include "nacl_io/typed_fs_factory.h"
 
 namespace nacl_io {
 
 std::string NormalizeHeaderKey(const std::string& s);
 
 class HttpFs : public Filesystem {
  public:
   typedef std::map<std::string, ScopedNode> NodeMap_t;
 
-  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 MakeUrlRequestInfo(const std::string& url,
                                  const char* method,
                                  StringMap_t* additional_headers);
 
@@ skipping 24 matching lines @@
   bool cache_content_;
   bool is_blob_url_;
 
   friend class TypedFsFactory<HttpFs>;
   friend class HttpFsNode;
 };
 
 }  // namespace nacl_io
 
 #endif  // LIBRARIES_NACL_IO_HTTPFS_HTTP_FS_H_