new_contents: #!/usr/bin/python3 -u
  
  '''Download the prebuilt clang binary built by chromium and is used by chromium.'''
  
  import os
  import os.path
  import subprocess
  
  UPDATE_SH_URL = 'https://chromium.googlesource.com/chromium/src/+/master/tools/clang/scripts/update.sh'
  CLANG_REVISION = 238013
  CLANG_SUB_REVISION = 1
  CDS_URL = 'https://commondatastorage.googleapis.com/chromium-browser-clang'
  
  def get_revision():
      '''Get the revision based encoded in chrome.sh'''
      # TODO: we need to get the raw output or try to parse the HTML output
      update_sh = subprocess.check_output(['curl', UPDATE_SH_URL],
                                          stderr=subprocess.DEVNULL,
                                          universal_newlines=True)
      revision = None
      sub_revision = None
      for line in update_sh.split('\n'):
          print('==' + line)
          if line.find('CLANG_REVISION') == 0:
              revision = line.split('=')
          elif line.find('CLANG_SUB_REVISION') == 0:
              sub_revision = line.split('=')
              break
      return revision, sub_revision
  
  
  def main():
      url = CDS_URL + '/Linux_x64/clang-%d-%d.tgz' % (CLANG_REVISION, CLANG_SUB_REVISION)
      output_dir = os.path.join(os.path.dirname(__file__), 'Linux_x64')
      if not os.path.exists(output_dir):
          os.makedirs(output_dir)
      print('Downloading %s to %s' % (url, output_dir))
      subprocess.check_call(['curl %s |tar zx -C %s' % (url, output_dir)],
                            shell=True)
  
  
  if __name__ == '__main__':
      main()
  
      
      
  
subject: Add script to download chromium prebuilt clang for Linux.