Add the missing version number comment for AndroidPolicyWriter

tools/grit/grit/format/policy_templates/writers/android_policy_writer.py

Index: tools/grit/grit/format/policy_templates/writers/android_policy_writer.py
diff --git a/tools/grit/grit/format/policy_templates/writers/android_policy_writer.py b/tools/grit/grit/format/policy_templates/writers/android_policy_writer.py
index 5d8cbef38f991b2964d15d36ce6f6e3b45133072..3f8518382a55582b185c3a845a8d273a1328e9c5 100755
--- a/tools/grit/grit/format/policy_templates/writers/android_policy_writer.py
+++ b/tools/grit/grit/format/policy_templates/writers/android_policy_writer.py
@@ -88,6 +88,9 @@ class AndroidPolicyWriter(xml_formatted_writer.XMLFormattedWriter):
   def BeginTemplate(self):
     comment_text = 'DO NOT MODIFY THIS FILE DIRECTLY!\n' \
                    'IT IS GENERATED FROM policy_templates.json.'
+    if self._GetChromiumVersionString():
+      comment_text += '\n' + self.config['build'] + ' version: '\
+                      + self._GetChromiumVersionString()
     comment_node = self._doc.createComment(comment_text)
     self._doc.insertBefore(comment_node, self._resources)