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

native_client_sdk/src/tests/nacl_io_test/kernel_object_test.cc

 // Copyright (c) 2012 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 <errno.h>
 #include <fcntl.h>
 #include <pthread.h>
 #include <sys/stat.h>
 
 #include <map>
@@ skipping 14 matching lines @@
  public:
   explicit NodeForTesting(Filesystem* fs) : Node(fs) {}
 };
 
 class FilesystemForTesting : public Filesystem {
  public:
   FilesystemForTesting() {}
 
  public:
   Error Access(const Path& path, int a_mode) { return ENOSYS; }
-  Error Open(const Path& path, int mode, ScopedNode* out_node) {
+  Error OpenWithMode(const Path& path, int open_flags,
+                     mode_t mode, ScopedNode* out_node) {
     out_node->reset(NULL);
     return ENOSYS;
   }
   Error Unlink(const Path& path) { return 0; }
   Error Mkdir(const Path& path, int permissions) { return 0; }
   Error Rmdir(const Path& path) { return 0; }
   Error Remove(const Path& path) { return 0; }
   Error Rename(const Path& path, const Path& newpath) { return 0; }
 };
 
@@ skipping 130 matching lines @@
   EXPECT_EQ(3, raw_handle->RefCount());
 
 
   handle.reset();
   EXPECT_EQ(2, raw_handle->RefCount());
 
   proxy.AcquireHandle(5, &handle);
   EXPECT_EQ(3, raw_handle->RefCount());
   EXPECT_EQ(raw_handle, handle.get());
 }