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

native_client_sdk/src/libraries/nacl_io/jsfs/js_fs.cc

 // Copyright 2014 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 "nacl_io/jsfs/js_fs.h"
 
 #include <assert.h>
 #include <errno.h>
 #include <fcntl.h>
 #include <limits.h>
@@ skipping 373 matching lines @@
     if (iter != responses_.end()) {
       PP_Var response = iter->second;
       responses_.erase(iter);
       return response;
     }
 
     pthread_cond_wait(&response_cond_, lock_.mutex());
   }
 }
 
-Error JsFs::Open(const Path& path, int open_flags, ScopedNode* out_node) {
+Error JsFs::OpenWithMode(const Path& path, int open_flags, mode_t t,
+                         ScopedNode* out_node) {
   out_node->reset(NULL);
   ScopedVar response(ppapi_);
   if (!SendRequestAndWait(&response, "%s%s%d",
                           "cmd", "open",
                           "path", path.Join().c_str(),
                           "oflag", open_flags)) {
     LOG_ERROR("Failed to send request.");
     return EINVAL;
   }
 
@@ skipping 86 matching lines @@
     LOG_TRACE("ioctl with no \"id\", ignoring.\n");
     return EINVAL;
   }
 
   responses_.insert(ResponseMap_t::value_type(response_id, response));
   pthread_cond_broadcast(&response_cond_);
   return 0;
 }
 
 }  // namespace nacl_io