new_contents: #!/usr/bin/env python3
  # Copyright (C) 2021 The Android Open Source Project
  #
  # Licensed under the Apache License, Version 2.0 (the "License");
  # you may not use this file except in compliance with the License.
  # You may obtain a copy of the License at
  #
  #      http://www.apache.org/licenses/LICENSE-2.0
  #
  # Unless required by applicable law or agreed to in writing, software
  # distributed under the License is distributed on an "AS IS" BASIS,
  # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  # See the License for the specific language governing permissions and
  # limitations under the License.
  
  import argparse
  from google.protobuf import descriptor_pb2
  
  
  # Take a path to file with binary protobuf descriptor as CLI argument and print
  # it in textproto format.
  #
  # Example usage:
  #   tools/print_descriptor.py path/to/file.descriptor
  def main():
    parser = argparse.ArgumentParser()
    parser.add_argument(
        'input_file',
        type=str,
        help='File name with binary proto descriptor to print')
    args = parser.parse_args()
  
    descriptor = descriptor_pb2.FileDescriptorSet()
    with open(args.input_file, 'rb') as f:
      contents = f.read()
      descriptor.MergeFromString(contents)
  
    print(descriptor)
  
  
  if __name__ == "__main__":
    main()
  
subject: Implement simple tool to print proto descriptor files