Add Mojo{Set,Get}DataPipeConsumerOptions() 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 0540cca9c672ee7d01e736097e27ff919fa109a4..3ebe2c1b5dbad63549d4273083011dd14b42eb81 100644
--- a/mojo/public/platform/native/system_impl_private.h
+++ b/mojo/public/platform/native/system_impl_private.h
@@ -101,6 +101,15 @@ MojoResult MojoSystemImplBeginWriteData(MojoSystemImpl system,
 MojoResult MojoSystemImplEndWriteData(MojoSystemImpl system,
                                       MojoHandle data_pipe_producer_handle,
                                       uint32_t num_elements_written);
+MojoResult MojoSystemImplSetDataPipeConsumerOptions(
+    MojoSystemImpl system,
+    MojoHandle data_pipe_consumer_handle,
+    const struct MojoDataPipeConsumerOptions* options);
+MojoResult MojoSystemImplGetDataPipeConsumerOptions(
+    MojoSystemImpl system,
+    MojoHandle data_pipe_consumer_handle,
+    struct MojoDataPipeConsumerOptions* options,
+    uint32_t options_num_bytes);
 MojoResult MojoSystemImplReadData(MojoSystemImpl system,
                                   MojoHandle data_pipe_consumer_handle,
                                   void* elements,