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

native_client_sdk/src/libraries/nacl_io/kernel_object.h

Index: native_client_sdk/src/libraries/nacl_io/kernel_object.h
diff --git a/native_client_sdk/src/libraries/nacl_io/kernel_object.h b/native_client_sdk/src/libraries/nacl_io/kernel_object.h
index 5563cf339c7f10ff848dec8ee08e3920bd7cffa2..2f707e09b7fa483f946a3e8f7be1f54a26445bda 100644
--- a/native_client_sdk/src/libraries/nacl_io/kernel_object.h
+++ b/native_client_sdk/src/libraries/nacl_io/kernel_object.h
@@ -62,7 +62,7 @@ class KernelObject {
   // specified by the |oflags|.
   // Assumes |out_fs| and |out_node| are non-NULL.
   Error AcquireFsAndNode(const std::string& path,
-                         int oflags,
+                         int oflags, mode_t mflags,
                          ScopedFilesystem* out_fs,
                          ScopedNode* out_node);