Add policy for fullscreen mode; disallow fullscreen in public sessions

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 99 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: 239
+#   For your editing convenience: highest ID currently used: 240
 #
 # 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 4105 matching lines @@
 
       When this policy is set, it specifies the length of time after which a user is automatically logged out, terminating the session. The user is informed about the remaining time by a countdown timer shown in the system tray.
 
       When this policy is not set, the session length is not limited.
 
       If you set this policy, users cannot change or override it.
 
       The policy value should be specified in milliseconds. Values are clamped to a range of 30 seconds to 24 hours.''',
     },
     {
+      'name': 'FullscreenAllowed',
+      'type': 'main',
+      'schema': { 'type': 'boolean' },
+      'supported_on': ['chrome.win:31-', 'chrome.linux:31-', 'chrome_os:31-'],
+      'features': {
+        'dynamic_refresh': True,
+        'per_profile': True,
+      },
+      'example_value': True,
+      'id': 240,
+      'caption': '''Allow fullscreen mode''',
+      'desc': '''Allow fullscreen mode.
+
+      This policy controls the availability of fullscreen mode in which all <ph name="PRODUCT_NAME">$1<ex>Google Chrome</ex></ph> UI is hidden and only web content is visible.
+
+      If this policy is set to true or not not configured, the user, apps and extensions with appropriate permissions can enter fullscreen mode.
+
+      If this policy is set to false, neither the user nor any apps or extensions can enter fullscreen mode.
+
+      On all platforms except <ph name="PRODUCT_OS_NAME">$2<ex>Google Chrome OS</ex></ph>, kiosk mode is unvailable when fullscreen mode is disabled.''',
+    },
+    {
       'name': 'PowerManagement',
       'type': 'group',
       'caption': '''Power mangement''',
       'desc': '''Configure power manegement in <ph name="PRODUCT_OS_NAME">$2<ex>Google Chrome OS</ex></ph>.
 
       These policies let you configure how <ph name="PRODUCT_OS_NAME">$2<ex>Google Chrome OS</ex></ph> behaves when the user remains idle for some amount of time.''',
       'policies': [
         {
           'name': 'ScreenDimDelayAC',
           'type': 'int',
@@ skipping 1350 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': [],
 }