message: Change visibility of hlo_proto.
diff: @@ -26,6 +26,7 @@ xla_proto_library(
  xla_proto_library(
  name = "hlo_proto",
  srcs = ["hlo.proto"],
  + visibility = ["//visibility:public"],
  deps = ["//tensorflow/compiler/xla:xla_data_proto"],
  )
  