Provide the equivalent of GURL::DomainIs for url::Origin.

url/origin.cc

 // Copyright 2015 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.
 
 #include "url/origin.h"
 
 #include <stdint.h>
 #include <string.h>
 
 #include "base/logging.h"
@@ skipping 54 matching lines @@
   return tuple_.Serialize();
 }
 
 bool Origin::IsSameOriginWith(const Origin& other) const {
   if (unique_ || other.unique_)
     return false;
 
   return tuple_.Equals(other.tuple_);
 }
 
+bool Origin::DomainIs(base::StringPiece lower_ascii_domain) const {
+  return !unique_ && url::DomainIs(tuple_.host(), lower_ascii_domain);
+}
+
 bool Origin::operator<(const Origin& other) const {
   return tuple_ < other.tuple_;
 }
 
 std::ostream& operator<<(std::ostream& out, const url::Origin& origin) {
   return out << origin.Serialize();
 }
 
 bool IsSameOriginWith(const GURL& a, const GURL& b) {
   return Origin(a).IsSameOriginWith(Origin(b));
 }
 
 }  // namespace url