message: Add the logging for the Google internal test
diff: @@ -258,6 +258,9 @@ class MatchingFilesDatasetOp : public DatasetOpKernel {
  const string& current_dir = current_path.first;
  std::vector<string> children;
  Status s = fs->GetChildren(current_dir, &children);
  + std::cout << "Children Num: " << children.size()
  + << "; Status: " << s.ToString()
  + << "; Current dir: " << current_dir << std::endl;
  ret.Update(s);
  // If GetChildren() fails, continue the next search.
  