Change Enterprise.Policies histogram bucket descriptions to policy names

components/policy/resources/PRESUBMIT.py

 # Copyright (c) 2012 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.
 
 # If this presubmit check fails or misbehaves, please complain to
 # mnissler@chromium.org, bartfab@chromium.org or atwilson@chromium.org.
 
 import itertools
 import sys
 import xml.dom.minidom
@@ skipping 72 matching lines @@
   enums = (tree.getElementsByTagName('histogram-configuration')[0]
                .getElementsByTagName('enums')[0]
                .getElementsByTagName('enum'))
   policy_enum = [e for e in enums
                  if e.getAttribute('name') == 'EnterprisePolicies'][0]
   policy_ids = frozenset([int(e.getAttribute('value'))
                           for e in policy_enum.getElementsByTagName('int')])
 
   error_missing = ('Policy \'%s\' was added to policy_templates.json but not '
                    'to src/tools/metrics/histograms/histograms.xml. '
-                   'Please update both files.')
+                   'Please update both files. To regenerate the policy part '
+                   'of histograms.xml, run:\n'
+                   'python tools/metrics/histograms/update_policies.py')
   results = []
   for policy in policies:
     if policy['id'] not in policy_ids:
       results.append(output_api.PresubmitError(error_missing % policy['name']))
   return results
 
 
 def _CommonChecks(input_api, output_api):
   results = []
   results.extend(_CheckPolicyTemplatesSyntax(input_api, output_api))
@@ skipping 13 matching lines @@
 
   return results
 
 
 def CheckChangeOnUpload(input_api, output_api):
   return _CommonChecks(input_api, output_api)
 
 
 def CheckChangeOnCommit(input_api, output_api):
   return _CommonChecks(input_api, output_api)