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

native_client_sdk/src/libraries/nacl_io/devfs/dev_fs.cc

Index: native_client_sdk/src/libraries/nacl_io/devfs/dev_fs.cc
diff --git a/native_client_sdk/src/libraries/nacl_io/devfs/dev_fs.cc b/native_client_sdk/src/libraries/nacl_io/devfs/dev_fs.cc
index f29e411794e62933050705ea3d43a178f958033a..108bdd26d226e0b6ac2ba95586ca1b68d2b5e436 100644
--- a/native_client_sdk/src/libraries/nacl_io/devfs/dev_fs.cc
+++ b/native_client_sdk/src/libraries/nacl_io/devfs/dev_fs.cc
@@ -240,7 +240,8 @@ Error FsNode::VIoctl(int request, va_list args) {
 
 }  // namespace
 
-Error DevFs::Open(const Path& path, int open_flags, ScopedNode* out_node) {
+Error DevFs::OpenWithMode(const Path& path, int open_flags,
+                          mode_t mode, ScopedNode* out_node) {
   out_node->reset(NULL);
   int error;
   if (path.Part(1) == "fs") {