Add support for Chrome policy type that references external data

grit/format/policy_templates/writers/plist_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.
 
 
 from xml.dom import minidom
 from grit.format.policy_templates.writers import plist_helper
 from grit.format.policy_templates.writers import xml_formatted_writer
 
@@ skipping 63 matching lines @@
     '''
     array = self._AddKeyValuePair(parent, 'pfm_targets', 'array')
     self.AddElement(array, 'string', {}, 'user-managed')
 
   def PreprocessPolicies(self, policy_list):
     return self.FlattenGroupsAndSortPolicies(policy_list)
 
   def WritePolicy(self, policy):
     policy_name = policy['name']
     policy_type = policy['type']
+    if policy_type == 'external':
+      # This type can only be set through cloud policy.
+      return
 
     dict = self.AddElement(self._array, 'dict')
     self._AddStringKeyValuePair(dict, 'pfm_name', policy_name)
     # Set empty strings for title and description. They will be taken by the
     # OSX Workgroup Manager from the string table in a Localizable.strings file.
     # Those files are generated by plist_strings_writer.
     self._AddStringKeyValuePair(dict, 'pfm_description', '')
     self._AddStringKeyValuePair(dict, 'pfm_title', '')
     self._AddTargets(dict)
     self._AddStringKeyValuePair(dict, 'pfm_type',
@@ skipping 25 matching lines @@
     dom_impl = minidom.getDOMImplementation('')
     doctype = dom_impl.createDocumentType(
         'plist',
         '-//Apple//DTD PLIST 1.0//EN',
         'http://www.apple.com/DTDs/PropertyList-1.0.dtd')
     self._doc = dom_impl.createDocument(None, 'plist', doctype)
     self._plist = self._doc.documentElement
 
   def GetTemplateText(self):
     return self.ToPrettyXml(self._doc)