Add thunks for MojoDuplicateHandle[WithReducedRights]().

mojo/public/platform/native/system_impl_private_thunks.h

Index: mojo/public/platform/native/system_impl_private_thunks.h
diff --git a/mojo/public/platform/native/system_impl_private_thunks.h b/mojo/public/platform/native/system_impl_private_thunks.h
index e29fc8e7eaaeab1ceb07ea9c7300df7bec5ab09e..296cb211f7b22e4b4f8a80aa73d5055444825a78 100644
--- a/mojo/public/platform/native/system_impl_private_thunks.h
+++ b/mojo/public/platform/native/system_impl_private_thunks.h
@@ -37,6 +37,14 @@ struct MojoSystemImplThunksPrivate {
   MojoResult (*GetRights)(MojoSystemImpl system,
                           MojoHandle handle,
                           MojoHandleRights* rights);
+  MojoResult (*DuplicateHandleWithReducedRights)(
+      MojoSystemImpl system,
+      MojoHandle handle,
+      MojoHandleRights rights_to_remove,
+      MojoHandle* new_handle);
+  MojoResult (*DuplicateHandle)(MojoSystemImpl system,
+                                MojoHandle handle,
+                                MojoHandle* new_handle);
   MojoResult (*Wait)(MojoSystemImpl system,
                      MojoHandle handle,
                      MojoHandleSignals signals,
@@ -157,6 +165,8 @@ inline MojoSystemImplThunksPrivate MojoMakeSystemImplThunksPrivate() {
       MojoSystemImplGetTimeTicksNow,
       MojoSystemImplClose,
       MojoSystemImplGetRights,
+      MojoSystemImplDuplicateHandleWithReducedRights,
+      MojoSystemImplDuplicateHandle,
       MojoSystemImplWait,
       MojoSystemImplWaitMany,
       MojoSystemImplCreateMessagePipe,