Implement Web Restrictions in WebView.

components/web_restrictions/interfaces/web_restrictions.mojom

Index: components/web_restrictions/interfaces/web_restrictions.mojom
diff --git a/components/web_restrictions/interfaces/web_restrictions.mojom b/components/web_restrictions/interfaces/web_restrictions.mojom
new file mode 100644
index 0000000000000000000000000000000000000000..e27e7d04f0b04094585dcbff9e415a150867144d
--- /dev/null
+++ b/components/web_restrictions/interfaces/web_restrictions.mojom
@@ -0,0 +1,17 @@
+// Copyright 2016 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.
+
+module web_restrictions.mojom;
+
+struct ClientResult {
+  map<string, int32> intParams;
+  map<string, string> stringParams;
+};
+
+interface WebRestrictions {
+  // Get the cached result, if any, of requesting access to a URL; including key/value pairs for
+  // custom error ints and strings.
+  GetResult(string url) => (ClientResult? reply);
+  RequestPermission(string url) => (bool result);
+};