Include chromium version number in policy templates

grit/format/policy_templates/writers/template_writer.py

Index: grit/format/policy_templates/writers/template_writer.py
===================================================================
--- grit/format/policy_templates/writers/template_writer.py	(revision 177)
+++ grit/format/policy_templates/writers/template_writer.py	(working copy)
@@ -3,6 +3,7 @@
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
+import os
 
 class TemplateWriter(object):
   '''Abstract base class for writing policy templates in various formats.
@@ -102,6 +103,16 @@
     is_supported = lambda x: platform in x['platforms']
     return any(filter(is_supported, policy['supported_on']))
 
+  def _GetChromiumVersionString(self):
+    '''Returns the Chromium version string stored in the environment variable
+    version (if it is set).
+
+    Returns: The Chromium version string or an empty string if it has not
+             been set.'''
+
+    if 'version' in self.config:
+      return self.config['version']
+
   def _GetPoliciesForWriter(self, group):
     '''Filters the list of policies in the passed group that are supported by
     the writer.
@@ -191,6 +202,13 @@
     '''
     raise NotImplementedError()
 
+  def WriteComment(self, comment):
+    '''Appends the comment to the internal buffer.                                                                                                                          
+
+      comment: The comment to be added.                                                                                     
+    '''
+    raise NotImplementedError()
+
   def WriteRecommendedPolicy(self, policy):
     '''Appends the template text corresponding to a recommended policy into the
     internal buffer.