new_contents: import sys
  from smart_open import open
  
  
  def read_lines(url, limit):
      lines = []
      with open(url, 'r', errors='ignore') as fin:
          for i, l in enumerate(fin):
              if i == limit:
                  break
              lines.append(l)
  
      return lines
  
  
  def test(benchmark):
      #
      # This file is around 850MB.
      #
      url = (
          's3://commoncrawl/crawl-data/CC-MAIN-2019-51/segments/1575541319511.97'
          '/warc/CC-MAIN-20191216093448-20191216121448-00559.warc.gz'
      )
      limit = 1000000
      lines = benchmark(read_lines, url, limit)
      assert len(lines) == limit
  
subject: add benchmarks