Add WebSerializedOrigin to represent a serialized Web Origin.

Source/platform/exported/WebSerializedOrigin.cpp

Index: Source/platform/exported/WebSerializedOrigin.cpp
diff --git a/Source/platform/exported/WebSerializedOrigin.cpp b/Source/platform/exported/WebSerializedOrigin.cpp
new file mode 100644
index 0000000000000000000000000000000000000000..f2712b7c528a892f275e8d9a105bec01c1c2bade
--- /dev/null
+++ b/Source/platform/exported/WebSerializedOrigin.cpp
@@ -0,0 +1,17 @@
+// 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 "config.h"
+#include "public/platform/WebSerializedOrigin.h"
+
+#include "platform/weborigin/SecurityOrigin.h"
+
+namespace blink {
+
+WebSerializedOrigin::WebSerializedOrigin(const WebCore::SecurityOrigin& origin)
+    : m_string(origin.toString())
+{
+}
+
+} // namespace blink