Support int-typed policies in policy template generator

chrome/app/policy/policy_templates.json

 {
 # policy_templates.json - Metafile for policy templates
 #
 # The content of this file is evaluated as a Python expression.
 #
 # This file is used as input to generate the following policy templates:
 # ADM, ADMX+ADML, MCX/plist and html documentation.
 #
 # Policy templates are user interface definitions or documents about the
 # policies that can be used to configure Chrome. Each policy is a name-value
 # pair where the value has a given type. Chrome looks up the values using the
 # names of the policies. In the user interface where the values can be set,
 # related policies might appear together in policy groups. The grouping is not
 # visible to Chrome.
 #
 # This file contains a list of policies and groups. Each group contains a list
 # of policies under the key 'policies'. All the policies and groups must have
 # unique names. Group names are not exposed to Chrome at all.
 #
 # Each policy has a type. The currently implemented types:
 #   'group': - not a real policy, contains a list of policies
 #     NOTE: Currently nesting groups inside other groups is not supported.
 #   'string' - a string value
+#   'int' - an integer value
 #   'int-enum' - the user can select an integer value from a collection of 
 #     items
 #   'string-enum' - the user can select a string value from a collection of 
 #     items
 #   'main' - a boolean value
 #   'list' - a list of string values
 #
 # Policy group descriptions, policy captions and similar texts are localized
 # strings taken from the <message> nodes of the .grd file. Their name
 # attributes are generated from the JSON keys.
@@ skipping 663 matching lines @@
     {
       'key': '$4',
       'value': 'http://www.chromium.org/developers/how-tos/chrome-frame-getting-started'
     },
     {
       'key': '$5',
       'value': 'http://www.chromium.org/administrators/policy-templates'
     },
   ]
 }