Add Mojo{Set,Get}DataPipeProducerOptions() to the NaCl system thunks.

mojo/public/platform/native/system_impl_private.h

Index: mojo/public/platform/native/system_impl_private.h
diff --git a/mojo/public/platform/native/system_impl_private.h b/mojo/public/platform/native/system_impl_private.h
index 3ebe2c1b5dbad63549d4273083011dd14b42eb81..6aeba449d79e5d98b12d979e256943b0bf15e465 100644
--- a/mojo/public/platform/native/system_impl_private.h
+++ b/mojo/public/platform/native/system_impl_private.h
@@ -88,6 +88,15 @@ MojoResult MojoSystemImplCreateDataPipe(
     const struct MojoCreateDataPipeOptions* options,
     MojoHandle* data_pipe_producer_handle,
     MojoHandle* data_pipe_consumer_handle);
+MojoResult MojoSystemImplSetDataPipeProducerOptions(
+    MojoSystemImpl system,
+    MojoHandle data_pipe_producer_handle,
+    const struct MojoDataPipeProducerOptions* options);
+MojoResult MojoSystemImplGetDataPipeProducerOptions(
+    MojoSystemImpl system,
+    MojoHandle data_pipe_producer_handle,
+    struct MojoDataPipeProducerOptions* options,
+    uint32_t options_num_bytes);
 MojoResult MojoSystemImplWriteData(MojoSystemImpl system,
                                    MojoHandle data_pipe_producer_handle,
                                    const void* elements,