Include chromium version number in policy templates

grit/format/policy_templates/writers/json_writer.py

 #!/usr/bin/env python
 # 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.
 
 import json
 
 from textwrap import TextWrapper
 from grit.format.policy_templates.writers import template_writer
 
@@ skipping 21 matching lines @@
 class JsonWriter(template_writer.TemplateWriter):
   '''Class for generating policy files in JSON format (for Linux). The
   generated files will define all the supported policies with example values
   set for them. This class is used by PolicyTemplateGenerator to write .json
   files.
   '''
 
   def PreprocessPolicies(self, policy_list):
     return self.FlattenGroupsAndSortPolicies(policy_list)
 
+  def WriteComment(self, comment):
+    self._out.append('// ' + comment)
+
   def WritePolicy(self, policy):
     if policy['type'] == 'external':
       # This type can only be set through cloud policy.
       return
     example_value_str = json.dumps(policy['example_value'], sort_keys=True)
 
     # Add comma to the end of the previous line.
     if not self._first_written:
       self._out[-2] += ','
 
@@ skipping 10 matching lines @@
     description = self._text_wrapper.wrap(policy['desc'])
     self._out += description;
     line = '  //"%s": %s' % (policy['name'], example_value_str)
     self._out.append('')
     self._out.append(line)
     self._out.append('')
 
     self._first_written = False
 
   def BeginTemplate(self):
+    if self._GetChromiumVersionString() is not None:
+      self.WriteComment(self.config['build'] + ''' version: ''' + \
+          self._GetChromiumVersionString())
     self._out.append(TEMPLATE_HEADER)
 
   def EndTemplate(self):
     self._out.append('}')
 
   def Init(self):
     self._out = []
     # The following boolean member is true until the first policy is written.
     self._first_written = True
     # Create the TextWrapper object once.
     self._text_wrapper = TextWrapper(
         initial_indent = '  // ',
         subsequent_indent = '  // ',
         break_long_words = False,
         width = 80)
 
   def GetTemplateText(self):
     return '\n'.join(self._out)