Browser-based guest policy implementation

components/policy/resources/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 102 matching lines @@
 #   templates and documentation. The policy definition list that Chrome sees
 #   will include policies marked with 'future'. If a WIP policy isn't meant to
 #   be seen by the policy providers either, the 'supported_on' key should be set
 #   to an empty list.
 #
 # IDs:
 #   Since a Protocol Buffer definition is generated from this file, unique and
 #   persistent IDs for all fields (but not for groups!) are needed. These are
 #   specified by the 'id' keys of each policy. NEVER CHANGE EXISTING IDs,
 #   because doing so would break the deployed wire format!
-#   For your editing convenience: highest ID currently used: 274
+#   For your editing convenience: highest ID currently used: 275
 #
 # Placeholders:
 #   The following placeholder strings are automatically substituted:
 #     $1 -> Google Chrome / Chromium
 #     $2 -> Google Chrome OS / Chromium OS
 #     $3 -> Google Chrome Frame / Chromium Frame
 #     $6 is reserved for doc_writer
 #
 # Device Policy:
 #   An additional flag device_only (optional, defaults to False) indicates
@@ skipping 6505 matching lines @@
 
       If there is more than one recommended locale, it is assumed that users will want to select among these locales. Locale and keyboard layout selection will be prominently offered when starting a public session. Otherwise, it is assumed that most users will want to use the pre-selected locale. Locale and keyboard layout selection will be less prominently offered when starting a public session.
 
       When this policy is set and automatic login is enabled (see the |DeviceLocalAccountAutoLoginId| and |DeviceLocalAccountAutoLoginDelay| policies), the automatically started public session will use the first recommended locale and the most popular keyboard layout matching this locale.
 
       The pre-selected keyboard layout will always be the most popular layout matching the pre-selected locale.
 
       This policy can only be set as recommended. You can use this policy to move a set of recommended locales to the top but users are always allowed to choose any locale supported by <ph name="PRODUCT_OS_NAME">$2<ex>Google Chrome OS</ex></ph> for their session.
       ''',
     },
+    {
+      'name': 'BrowserGuestModeEnabled',
+      'type': 'main',
+      'schema': { 'type': 'boolean' },
+      'supported_on': ['chrome.*:39-'],
+      'features': {
+        'dynamic_refresh': True,
+        'per_profile': False,
+      },
+      'example_value': True,
+      'id': 275,
+      'caption': '''Enable guest mode in browser''',
+      'desc': '''If this policy is set to true or not configured, <ph name="PRODUCT_NAME">$1<ex>Google Chrome</ex></ph> will enable guest logins. Guest logins are <ph name="PRODUCT_NAME">$1<ex>Google Chrome</ex></ph> profiles where all windows are in incognito mode.
 
+      If this policy is set to false, <ph name="PRODUCT_NAME">$1<ex>Google Chrome</ex></ph> will not allow guest profiles to be started.''',
+    },
   ],
   'messages': {
     # Messages that are not associated to any policies.
     'win_supported_winxpsp2': {
       'desc': '''A label specifying the oldest possible compatible version of Windows. This text will appear right next to a label containing the text 'Supported on:'.''',
       'text': '''Microsoft Windows XP SP2 or later'''
     },
     'mac_chrome_preferences': {
       'desc': '''A text indicating in Mac OS X Workgroup Manager, that currently the preferences of Chromium are being edited''',
       'text': '''<ph name="PRODUCT_NAME">$1<ex>Google Chrome</ex></ph> preferences'''
@@ skipping 96 matching lines @@
       'desc': '''Text appended in parentheses to the policy name to indicate that it has been deprecated''',
       'text': 'deprecated',
     },
     'doc_recommended': {
       'desc': '''Text appended in parentheses next to the policies top-level container to indicate that those policies are of the Recommended level''',
       'text': 'Default Settings (users can override)',
     },
   },
   'placeholders': [],
 }