Add login screen locale and input method device policies

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 121 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: 363
+#   For your editing convenience: highest ID currently used: 365
 #   And don't forget to also update the EnterprisePolicies enum of
 #   histograms.xml.
 #
 # 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
 #
@@ skipping 9385 matching lines @@
       The policy should be speicified as a string that expresses the URL and hash in JSON format, e.g.,
       {
         "url": "https://example.com/device_wallpaper.jpg",
         "hash": "examplewallpaperhash"
       }
 
       If the device wallpaper policy is set, the Chrome OS device will download and use the wallpaper image on the login screen if no user has yet signed in to the device. Once the user logs in, the user's wallpaper policy kicks in.
 
       If the device wallpaper policy is left not set, it's the user's wallpaper policy to decide what to show if the user's wallpaper policy is set.''',
     },
+    {
+      'name': 'DeviceLoginScreenLocales',
+      'type': 'list',
+      'schema': {
+        'type': 'array',
+        'items': { 'type': 'string' },
+      },
+      'supported_on': ['chrome_os:58-'],
+      'device_only': True,
+      'features': {
+        'dynamic_refresh': False,
+      },
+      'example_value': [ "en-US" ],
+      'max_size': 16777216,
+      'id': 364,
+      'caption': '''Device sign-in screen locale''',
+      'tags': [],
+      'desc': '''Configures the locale which is enforced on the <ph name="PRODUCT_OS_NAME">$2<ex>Google Chrome OS</ex></ph> sign-in screen.
+
+      If this policy is set, the sign-in screen will always be displayed in the locale which is given by the first value of this policy (the policy is defined as a list for forward compatibility).  If this policy is not set or is set to an empty list, the sign-in screen will be displayed in the locale of the last user session.  If this policy is set to a value which is not a valid locale, the sign-in screen will be displayed in a fallback locale (currently, en-US).'''
+    },
+    {
+      'name': 'DeviceLoginScreenInputMethods',
+      'type': 'list',
+      'schema': {
+        'type': 'array',
+        'items': { 'type': 'string' },
+      },
+      'supported_on': ['chrome_os:58-'],
+      'device_only': True,
+      'features': {
+        'dynamic_refresh': True,
+      },
+      'example_value': [ "xkb:us::en", "xkb:ch::ger" ],
+      'max_size': 16777216,
+      'id': 365,
+      'caption': '''Device sign-in screen keyboard layouts''',
+      'tags': [],
+      'desc': '''Configures which keyboard layouts are allowed on the <ph name="PRODUCT_OS_NAME">$2<ex>Google Chrome OS</ex></ph> sign-in screen.
+
+      If this policy is set to a list of input method identifiers, the given input methods will be available on the sign-in screen. The first given input method will be preselected. While a user pod is focused on the sign-in screen, the user's least recently used input method will be available in addition to the input methods given by this policy.  If this policy is not set, the input methods on the sign-in screen will be derived from the locale in which the sign-in screen is displayed.  Values which are not valid input method identifiers will be ignored.''',
+    },
   ],
   '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 113 matching lines @@
       '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)',
     },
     'doc_complex_policies_on_windows': {
       'desc': '''Text pointing the user to a help article for complex policies on Windows''',
       'text': '''encoded as a JSON string, for details see <ph name="COMPLEX_POLICIES_URL">https://www.chromium.org/administrators/complex-policies-on-windows<ex>https://www.chromium.org/administrators/complex-policies-on-windows</ex></ph>''',
     },
   },
   'placeholders': [],
 }