Policy: generate boilerplate policy type and constant code.

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
@@ skipping 697 matching lines @@
 
           You can specify the default search provider to be used by setting the rest of the default search policies. If these are left empty, the user can choose the default provider.
 
           If you diable this setting, no search is performed when the user enters non-URL text in the omnibox.
 
           If you enable or disable this setting, users cannot change or override this setting in <ph name="PRODUCT_NAME">
           $1<ex>Google Chrome</ex>
           </ph>.''',
         },
         {
+          'name': 'BlockThirdPartyCookies',
+          'type': 'main',
+          'supported_on': ['chrome.*:10-'],
+          'features': {'dynamic_refresh': 1},
+          'example_value': False,
+          'caption': '''Block third party cookies''',
+          'desc': '''Blocks third party cookies.
+
+          Enabling this setting prevents cookies from being set by web page elements that are not from the domain that is in the browser's address bar.
+
+          Disabling this setting allows cookies to be set by web page elements that are not from the domain that is in the browser's address bar and prevents users from changing this setting.''',
+        },
+        {
           'name': 'DefaultSearchProviderName',
           'type': 'string',
           'supported_on': ['chrome.*:8-'],
           'features': {'dynamic_refresh': 1},
           'example_value': 'My Intranet Search',
           'caption': '''Default search provider name''',
           'desc': '''Specifies the name of the default search provider. If left empty, the host name specified by the search URL will be used.''',
         },
         {
           'name': 'DefaultSearchProviderKeyword',
@@ skipping 428 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'
     },
   ]
 }