Add thunks for MojoDuplicateHandle[WithReducedRights]().

mojo/public/platform/nacl/libmojo.cc

Index: mojo/public/platform/nacl/libmojo.cc
diff --git a/mojo/public/platform/nacl/libmojo.cc b/mojo/public/platform/nacl/libmojo.cc
index 716877ce5468f7a4160d4f6d14134eb09510b204..c25aff218ce16960919c3d4157e747d35bbb7d49 100644
--- a/mojo/public/platform/nacl/libmojo.cc
+++ b/mojo/public/platform/nacl/libmojo.cc
@@ -60,6 +60,24 @@ MojoResult MojoGetRights(MojoHandle handle, MojoHandleRights* rights) {
   return irt_mojo->MojoGetRights(handle, rights);
 }
 
+MojoResult MojoDuplicateHandleWithReducedRights(
+    MojoHandle handle,
+    MojoHandleRights rights_to_remove,
+    MojoHandle* new_handle) {
+  struct nacl_irt_mojo* irt_mojo = get_irt_mojo();
+  if (!irt_mojo)
+    abort();
+  return irt_mojo->MojoDuplicateHandleWithReducedRights(
+      handle, rights_to_remove, new_handle);
+}
+
+MojoResult MojoDuplicateHandle(MojoHandle handle, MojoHandle* new_handle) {
+  struct nacl_irt_mojo* irt_mojo = get_irt_mojo();
+  if (!irt_mojo)
+    abort();
+  return irt_mojo->MojoDuplicateHandle(handle, new_handle);
+}
+
 MojoResult MojoWait(MojoHandle handle,
                     MojoHandleSignals signals,
                     MojoDeadline deadline,