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

native_client_sdk/src/libraries/nacl_io/html5fs/html5_fs.cc

Index: native_client_sdk/src/libraries/nacl_io/html5fs/html5_fs.cc
diff --git a/native_client_sdk/src/libraries/nacl_io/html5fs/html5_fs.cc b/native_client_sdk/src/libraries/nacl_io/html5fs/html5_fs.cc
index 1cd8c3723b91e8a8c7a2f13a13288d24fa361b1a..c747733231042d864218a51db54c9536ba8172d9 100644
--- a/native_client_sdk/src/libraries/nacl_io/html5fs/html5_fs.cc
+++ b/native_client_sdk/src/libraries/nacl_io/html5fs/html5_fs.cc
@@ -29,7 +29,8 @@ int64_t strtoull(const char* nptr, char** endptr, int base) {
 
 }  // namespace
 
-Error Html5Fs::Open(const Path& path, int open_flags, ScopedNode* out_node) {
+Error Html5Fs::OpenWithMode(const Path& path, int open_flags, mode_t mode,
+                            ScopedNode* out_node) {
   out_node->reset(NULL);
   Error error = BlockUntilFilesystemOpen();
   if (error)