[NaCl SDK] nacl_io: Add chmod/fchmod

native_client_sdk/src/libraries/nacl_io/memfs/mem_fs_node.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.
 
 #ifndef __STDC_LIMIT_MACROS
 #define __STDC_LIMIT_MACROS
 #endif
 
 #include "nacl_io/memfs/mem_fs_node.h"
 
@@ skipping 104 matching lines @@
     }
     data_capacity_ = new_capacity;
   }
 
   if (new_length > stat_.st_size)
     memset(data_ + stat_.st_size, 0, new_length - stat_.st_size);
   stat_.st_size = new_length;
   return 0;
 }
 
+Error MemFsNode::Fchmod(mode_t mode) {
+  AUTO_LOCK(node_lock_);
+  SetMode(mode);
+  return 0;
+}
+
 }  // namespace nacl_io