message: capture_tpu_profile will fallback to old behavior if user specify local directories as model directory.
diff: @@ -70,8 +70,12 @@ ProfileResponse Profile(const string& service_addr, int duration_ms,
  ProfileRequest request;
  request.set_duration_ms(duration_ms);
  request.set_max_events(kMaxEvents);
  + if (tensorflow::str_util::StartsWith(repository_root, "gs://")) {
  + // For backward compatibilities, only generate tracetable etc when the
  + // user provide a GCS path for model directory.
  request.set_repository_root(repository_root);
  request.set_session_id(session_id);
  + }
  request.add_tools("input_pipeline");
  request.add_tools("overview_page");
  *request.mutable_opts() = opts;
  