def ToJsonString(self):
    """Converts FieldMask to string according to proto3 JSON spec."""
    camelcase_paths = []
    for path in self.paths:
      camelcase_paths.append(_SnakeCaseToCamelCase(path))
    return ','.join(camelcase_paths)
Converts FieldMask to string according to proto3 JSON spec.
deps/protobuf/python/google/protobuf/internal/well_known_types.py