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

native_client_sdk/src/libraries/nacl_io/stream/stream_fs.cc

Index: native_client_sdk/src/libraries/nacl_io/stream/stream_fs.cc
diff --git a/native_client_sdk/src/libraries/nacl_io/stream/stream_fs.cc b/native_client_sdk/src/libraries/nacl_io/stream/stream_fs.cc
index a7d9184378381e3c77761f617e8fc866bdbfaec3..703874fa6018a7563897b275cd8c54245fc95393 100644
--- a/native_client_sdk/src/libraries/nacl_io/stream/stream_fs.cc
+++ b/native_client_sdk/src/libraries/nacl_io/stream/stream_fs.cc
@@ -84,7 +84,8 @@ StreamFs::~StreamFs() {
   pthread_cond_destroy(&message_cond_);
 }
 
-Error StreamFs::Open(const Path& path, int o_flags, ScopedNode* out_node) {
+Error StreamFs::OpenWithMode(const Path& path, int o_flags, mode_t mode,
+                             ScopedNode* out_node) {
   return EACCES;
 }