Add WebSerializedOrigin to represent a serialized Web Origin.

public/platform/WebSerializedOrigin.h

Index: public/platform/WebSerializedOrigin.h
diff --git a/public/platform/WebSerializedOrigin.h b/public/platform/WebSerializedOrigin.h
new file mode 100644
index 0000000000000000000000000000000000000000..0e01ae4cca0e0f2e6c9eec9f9a32de98d7084a1b
--- /dev/null
+++ b/public/platform/WebSerializedOrigin.h
@@ -0,0 +1,40 @@
+// 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 WebSerializedOrigin_h
+#define WebSerializedOrigin_h
+
+#include "WebString.h"
+
+#if INSIDE_BLINK
+namespace WebCore { class SecurityOrigin; }
+#else
+#include <url/origin.h>
+#endif
+
+namespace blink {
+
+// WebSerializedOrigin represents a serialized Web Origin specified in RFC6454.
+class WebSerializedOrigin {
+public:
+    WebSerializedOrigin() : m_string("null") { }
+#if INSIDE_BLINK
+    BLINK_PLATFORM_EXPORT WebSerializedOrigin(const WebCore::SecurityOrigin&);
+#else
+    WebSerializedOrigin(const url::Origin& origin) : m_string(WebString::fromUTF8(origin.string())) { }
+    operator url::Origin() const { return url::Origin(m_string.utf8()); }
+#endif
+
+    const WebString& string() const
+    {
+        return m_string;
+    }
+
+private:
+    const WebString m_string;
+};
+
+} // namespace blink
+
+#endif // #ifndef SerializedOrigin_h