message: Export build_toco_convert_protos
diff: @@ -22,6 +22,7 @@ EXPERIMENTAL: APIs here are unstable and likely to change without notice.
  @@Interpreter
  @@OpHint
  @@convert_op_hints_to_stubs
  +@@build_toco_convert_protos
  @@FLOAT
  @@QUANTIZED_UINT8
  