Histograms.xml python script housekeeping

tools/metrics/histograms/histogram_ownership.py

 #!/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 os
+import sys
 import xml.etree.ElementTree
 
+sys.path.append(os.path.join(os.path.dirname(__file__), '..'))  # tools/metrics
+from common import path_util
+
 DUMMY_OWNER = "Please list the metric's owners. Add more owner tags as needed."
 
 def main():
-  tree = xml.etree.ElementTree.parse('histograms.xml')
+  tree = xml.etree.ElementTree.parse(path_util.GetHistogramsFile())
   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
@@ skipping 17 matching lines @@
       owners.append(node.text)
 
     if not obsolete:
       if owners:
         print name, ' '.join(owners)
       else:
         print name, 'NO_OWNER'
 
 if __name__ == '__main__':
   main()