Added classes to enable session sync functionality.

chrome/browser/dom_ui/value_helper.h

Index: chrome/browser/dom_ui/value_helper.h
diff --git a/chrome/browser/dom_ui/value_helper.h b/chrome/browser/dom_ui/value_helper.h
new file mode 100644
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--- /dev/null
+++ b/chrome/browser/dom_ui/value_helper.h
@@ -0,0 +1,25 @@
+// Copyright (c) 2010 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 CHROME_BROWSER_DOM_UI_VALUE_HELPER_H_
+#define CHROME_BROWSER_DOM_UI_VALUE_HELPER_H_
+#pragma once
+
+#include "chrome/browser/sessions/tab_restore_service.h"
+
+#include "base/values.h"
+
+// Used to convert TabRestoreService elements to values for JSON processing.
+class ValueHelper {
+ public:
+  static bool TabToValue(const TabRestoreService::Tab& tab,
+      DictionaryValue* dictionary);
+  static bool WindowToValue(const TabRestoreService::Window& window,
+      DictionaryValue* dictionary);
+ private:
+  DISALLOW_IMPLICIT_CONSTRUCTORS(ValueHelper);
+};
+
+#endif  // CHROME_BROWSER_DOM_UI_VALUE_HELPER_H_
+