Add login screen locale and input method device policies

components/policy/resources/policy_templates.json

Index: components/policy/resources/policy_templates.json
diff --git a/components/policy/resources/policy_templates.json b/components/policy/resources/policy_templates.json
index 28d3c99f8ed01a249943ef9d8365f8cfc9b8bdba..5e846548386338d53176efc74137e99a37e97ed4 100644
--- a/components/policy/resources/policy_templates.json
+++ b/components/policy/resources/policy_templates.json
@@ -139,7 +139,7 @@
 #   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: 360
+#   For your editing convenience: highest ID currently used: 362
 #   And don't forget to also update the EnterprisePolicies enum of
 #   histograms.xml.
 #
@@ -9448,6 +9448,44 @@
 
       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': 361,
+      'caption': '''Device sign-in screen locale''',
+      'tags': [],
+      'desc': '''Configures the locale which is enforced on the sign-in screen.''',

[pastarmovj, 2017/01/25 15:42:20]

Please extend the documentation a little bit more. E.g. what happens when this
policy is not set. What happens if the locale is not correct etc. Also this
descriptions says "the locale" and it is a list so it can be more than one
locale, if only one is respected now but the plan is to support multiple
document this too.

[pmarko, 2017/01/26 12:32:58]

Done.

+    },
+    {
+      'name': 'DeviceLoginScreenInputMethods',
+      'type': 'list',
+      'schema': {
+        'type': 'array',
+        'items': { 'type': 'string' },
+      },
+      'supported_on': ['chrome_os:58-'],
+      'device_only': True,
+      'features': {
+        'dynamic_refresh': True,

[pastarmovj, 2017/01/25 15:42:20]

Is it correct that one is dynamic refresh and the other isn't?

[pmarko, 2017/01/26 12:32:58]

Yes, the reason is that changing locale dynamically is currently only supported
in very special situations (e.g. OOBE before login - the webui needs to support
reload, etc.).
The critical situation is when the login screen is displayed and the
DeviceLoginScreenLocales policy changes.
Currently, nothing happens until you restart the browser (hence dynamic_refresh:
False there).
I thought about re-starting the browser automatically, but after all I think
it's not really worth the added complexity. To do it properly, I would need to
add idle detection to not restart the browser when the user is typing something.

+      },
+      'example_value': [ "xkb:us::en" ],
+      'max_size': 16777216,
+      'id': 362,
+      'caption': '''Device sign-in screen keyboard layouts''',
+      'tags': [],
+      'desc': '''Configures which keyboard layouts are allowed on the sign-in screen.''',

[pastarmovj, 2017/01/25 15:42:20]

Same as above.

[pmarko, 2017/01/26 12:32:58]

Done.

+    },
   ],
   'messages': {
     # Messages that are not associated to any policies.