message: Add a config_setting for chromiumos on arm64.
  For compatibility with existing internal code, we have to perpetuate an oddity:
  the 'cpu' is just 'arm' when 'arm64' is meant.
diff: @@ -23,6 +23,15 @@ config_setting(
  define_values = {"tflite_with_ruy": "false"},
  )
  +config_setting(
  + name = "chromiumos_arm64",
  + values = {
  + "crosstool_top": "//external:chromiumos/crosstool",
  + "cpu": "arm",
  + },
  + visibility = ["//visibility:public"],
  +)
  +
  # Suppress warnings that are introduced by Eigen Tensor.
  EXTRA_EIGEN_COPTS = select({
  "//tensorflow:ios": [
  