message: Update code to use new flag name: dump_graphviz_dir
diff: @@ -203,8 +203,9 @@ def _check_flags(flags, unparsed):
  raise ValueError("--default_ranges_min and --default_ranges_max must be "
  "used together")
  - if flags.dump_graphviz_video and not flags.dump_graphviz:
  - raise ValueError("--dump_graphviz_video must be used with --dump_graphviz")
  + if flags.dump_graphviz_video and not flags.dump_graphviz_dir:
  + raise ValueError("--dump_graphviz_video must be used with "
  + "--dump_graphviz_dir")
  def run_main(_):
  