Add proxy settings to network control at upper row of controls at login screen.

chrome/browser/chromeos/login/proxy_settings_dialog.h

+// 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_CHROMEOS_LOGIN_PROXY_SETTINGS_DIALOG_H_
+#define CHROME_BROWSER_CHROMEOS_LOGIN_PROXY_SETTINGS_DIALOG_H_
+#pragma once
+
+#include "chrome/browser/chromeos/login/login_html_dialog.h"
+#include "gfx/native_widget_types.h"
+
+namespace chromeos {
+
+class ProxySettingsDialog : public LoginHtmlDialog {
+ public:
+  ProxySettingsDialog(LoginHtmlDialog::Delegate* delegate,
+                      gfx::NativeWindow window);
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(ProxySettingsDialog);
+};
+
+}  // namespace chromeos
+
+#endif  // CHROME_BROWSER_CHROMEOS_LOGIN_PROXY_SETTINGS_DIALOG_H_