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

native_client_sdk/src/tests/nacl_io_test/mock_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 TESTS_NACL_IO_TEST_MOCK_FS_H_
 #define TESTS_NACL_IO_TEST_MOCK_FS_H_
 
 #include "gmock/gmock.h"
 
 #include "nacl_io/filesystem.h"
 
 class MockFs : public nacl_io::Filesystem {
  public:
   typedef nacl_io::Error Error;
   typedef nacl_io::FsInitArgs FsInitArgs;
   typedef nacl_io::Path Path;
   typedef nacl_io::PepperInterface PepperInterface;
   typedef nacl_io::ScopedNode ScopedNode;
   typedef nacl_io::StringMap_t StringMap_t;
 
   MockFs();
   virtual ~MockFs();
 
   MOCK_METHOD1(Init, Error(const FsInitArgs&));
   MOCK_METHOD0(Destroy, void());
   MOCK_METHOD2(Access, Error(const Path&, int));
   MOCK_METHOD3(Open, Error(const Path&, int, ScopedNode*));
+  MOCK_METHOD4(OpenWithMode, Error(const Path&, int, mode_t, ScopedNode*));
   MOCK_METHOD2(OpenResource, Error(const Path&, ScopedNode*));
   MOCK_METHOD1(Unlink, Error(const Path&));
   MOCK_METHOD2(Mkdir, Error(const Path&, int));
   MOCK_METHOD1(Rmdir, Error(const Path&));
   MOCK_METHOD1(Remove, Error(const Path&));
   MOCK_METHOD2(Rename, Error(const Path&, const Path&));
 };
 
 #endif  // TESTS_NACL_IO_TEST_MOCK_FS_H_