Implemented system tray UI for new account management.

ash/system/user/config.h

+// 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 ASH_SYSTEM_USER_CONFIG_H_
+#define ASH_SYSTEM_USER_CONFIG_H_
+
+#include "base/macros.h"
+
+namespace ash {
+namespace tray {
+
+// Returns true when multi profile is supported and user is active.
+bool IsMultiProfileSupportedAndUserActive();
+
+// Returns true when multi account is supported and user is active.
+bool IsMultiAccountSupportedAndUserActive();
+
+}  // namespace tray
+}  // namespace ash
+
+#endif  // ASH_SYSTEM_USER_CONFIG_H_