Introduce url::Origin to represent Web Origin.

url/origin.cc

Index: url/origin.cc
diff --git a/url/origin.cc b/url/origin.cc
new file mode 100644
index 0000000000000000000000000000000000000000..b9286c8125f9f2b1173f2d2254e9c913ef1aa062
--- /dev/null
+++ b/url/origin.cc
@@ -0,0 +1,18 @@
+// 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.
+
+#include "url/origin.h"
+
+#include "base/strings/string_util.h"
+
+namespace url {
+
+Origin::Origin() {}
+
+Origin::Origin(const std::string& origin) : string_(origin) {
+  DCHECK(origin == "null" || MatchPattern(origin, "?*://?*"));

[brettw, 2014/03/12 05:34:54]

Seems to me that this should also accept an empty string, or the default
constructor should initialize to null to make clear that an empty origin string
is always illegal.

[yhirano, 2014/03/12 05:48:20]

Thanks, done.

+  DCHECK_NE(origin[origin.size() - 1], '/');

[brettw, 2014/03/12 05:34:54]

...and this shouldn't crash on empty string.

[yhirano, 2014/03/12 05:48:20]

Done.

+}
+
+}  // namespace url