ChromeOS login webui refactoring: split user selection/gaia login screens.

chrome/browser/chromeos/login/screens/gaia_screen.h

+// Copyright (c) 2012 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_SCREENS_GAIA_SCREEN_H_
+#define CHROME_BROWSER_CHROMEOS_LOGIN_SCREENS_GAIA_SCREEN_H_
+
+#include <string>
+
+#include "base/bind.h"
+#include "base/compiler_specific.h"
+
+namespace chromeos {
+
+class LoginDisplayWebUIHandler;
+
+// This class represents GAIA screen: login screen that is responsible for
+// GAIA-based sign-in.
+class GaiaScreen {
+ public:
+  GaiaScreen();
+  virtual ~GaiaScreen();
+  void SetHandler(LoginDisplayWebUIHandler* handler);
+
+ private:
+  LoginDisplayWebUIHandler* handler_;
+
+  DISALLOW_COPY_AND_ASSIGN(GaiaScreen);
+};
+
+}  // namespace chromeos
+
+#endif  // CHROME_BROWSER_CHROMEOS_LOGIN_SCREENS_GAIA_SCREEN_H_