new_contents: #!/usr/bin/env python
  # Copyright 2014 The Chromium Authors. All rights reserved.
  # Use of this source code is governed by a BSD-style license that can be
  # found in the LICENSE file.
  
  """A simple tool to go through histograms.xml and print out the owners for
  histograms.
  """
  
  import xml.etree.ElementTree
  
  DUMMY_OWNER = "Please list the metric's owners. Add more owner tags as needed."
  
  def main():
    tree = xml.etree.ElementTree.parse('histograms.xml')
    root = tree.getroot()
    assert root.tag == 'histogram-configuration'
  
    root_children = root.getchildren()
    histograms = None
    for node in root_children:
      if node.tag == 'histograms':
        histograms = node
        break
    assert histograms != None
  
    for histogram in histograms.getchildren():
      if histogram.tag != 'histogram':
        continue
  
      name = histogram.attrib['name']
      owners = []
      obsolete = False
      for node in histogram.getchildren():
        if node.tag == 'obsolete':
          obsolete = True
          continue
        if node.tag != 'owner':
          continue
        if node.text == DUMMY_OWNER:
          continue
        assert '@' in node.text
        owners.append(node.text)
  
      if not obsolete:
        if owners:
          print name, ' '.join(owners)
        else:
          print name, 'NO_OWNER'
  
  if __name__ == '__main__':
    main()
  
subject: Add a script to print out histogram ownership.