Introduce url::Origin to represent Web Origin.

url/origin.h

+// 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.
+
+#ifndef URL_ORIGIN_H_
+#define URL_ORIGIN_H_
+
+#include <string>
+
+#include "url/url_export.h"
+
+namespace url {
+
+// Origin represents a Web Origin serialized to a string.
+// See RFC6454 for details.
+class URL_EXPORT Origin {
+ public:
+  Origin();
+  explicit Origin(const std::string& origin);
+
+  const std::string& string() const { return string_; }
+
+  bool IsSameAs(const Origin& that) const {
+    return string_ == that.string_;
+  }
+
+ private:
+  std::string string_;
+};
+
+}  // namespace url
+
+#endif  // URL_ORIGIN_H_