Implement Web Restrictions in WebView.

components/supervised_user_error_page/BUILD.gn

Index: components/supervised_user_error_page/BUILD.gn
diff --git a/components/supervised_user_error_page/BUILD.gn b/components/supervised_user_error_page/BUILD.gn
index 410712845e92241402debb282703f43d73ebd8ae..944a66032a20e883e8e79994ebef4c58f6b142c8 100644
--- a/components/supervised_user_error_page/BUILD.gn
+++ b/components/supervised_user_error_page/BUILD.gn
@@ -14,6 +14,28 @@ source_set("supervised_user_error_page") {
     "//components/strings",
     "//ui/base",
   ]
+
+  if (target_os == "android") {
+    sources += [
+      "supervised_user_error_page_android.cc",
+      "supervised_user_error_page_android.h",
+    ]
+    deps += [ "//components/web_restrictions:interfaces" ]
+  }
+}
+
+if (target_os == "android") {
+  source_set("gin") {
+    sources = [
+      "gin_wrapper.cc",
+      "gin_wrapper.h",
+    ]
+    deps = [
+      "//components/web_restrictions:interfaces",
+      "//content/public/renderer",
+      "//gin:gin",
+    ]
+  }
 }
 
 source_set("unit_tests") {