Implement Web Restrictions in WebView.

components/supervised_user_error_page/BUILD.gn

 # Copyright 2014 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 source_set("supervised_user_error_page") {
   sources = [
     "supervised_user_error_page.cc",
     "supervised_user_error_page.h",
   ]
 
   deps = [
     "//base",
     "//components/resources",
     "//components/strings",
     "//ui/base",
   ]
 }
 
+if (target_os == "android") {
+  source_set("gin") {
+    sources = [
+      "supervised_user_gin_wrapper.cc",
+      "supervised_user_gin_wrapper.h",
+    ]
+    deps = [
+      "//components/web_restrictions:interfaces",
+      "//content/public/renderer",
+    ]
+  }
+}
+
 source_set("unit_tests") {
   testonly = true
   sources = [
     "supervised_user_error_page_unittest.cc",
   ]
   deps = [
     ":supervised_user_error_page",
     "//base",
     "//base/test:test_support",
     "//components/resources",
     "//components/strings",
     "//testing/gmock",
     "//testing/gtest",
     "//ui/base",
   ]
 }