Implement Web Restrictions in WebView.

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 edd7c26bbcd49a8ee7b930f6be40e1e03c92ee58..e2197a857afc73d5fad4b1ce974d25345310329f 100644
--- a/components/policy/resources/policy_templates.json
+++ b/components/policy/resources/policy_templates.json
@@ -137,7 +137,7 @@
 #   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: 329
+#   For your editing convenience: highest ID currently used: 330
 #
 # Placeholders:
 #   The following placeholder strings are automatically substituted:
@@ -8519,6 +8519,21 @@
       'tags': [],
       'id': 329,
     },
+    {
+      'name': 'WebRestrictionsAuthority',
+      'id': 330,
+      'type': 'string',
+      'schema' : { 'type': 'string' },
+      'tags': [],
+      'supported_on': ['webview_android:52-'],

[Bernhard Bauer, 2016/05/19 10:00:15]

Add android here as well? Alternatively, update the description to remove the
browser.

[aberent, 2016/05/19 15:44:03]

Removed browser from description for now (this will be a separate CL). Also
changed version to 53, because this isn't going to land before the branch point
(today).

+      'caption': '''Set an external source of URL restrictions''',
+      'desc' : '''When this policy is set to a non-empty string the browser or WebView will read URL restrictions from the content provider with the given authority name.''',
+      'features': {
+        'dynamic_refresh': True,
+        'per_profile': False,
+      },
+      'example_value': 'com.android.chrome.SupervisedUserProvider'
+    },
   ],
   'messages': {
     # Messages that are not associated to any policies.