Implemented system tray UI for new account management.

ash/system/user/config.cc

+// 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 "ash/system/user/config.h"
+
+#include "ash/session_state_delegate.h"
+#include "ash/shell.h"
+#include "ash/shell_delegate.h"
+
+namespace ash {
+namespace tray {
+
+namespace {
+
+// Returns true if session is blocked by e.g. the login screen.
+bool IsUserSessionBlocked() {
+  return Shell::GetInstance()
+             ->session_state_delegate()
+             ->IsUserSessionBlocked();
+}
+
+}  // namespace
+
+bool IsMultiProfileSupportedAndUserActive() {
+  return Shell::GetInstance()->delegate()->IsMultiProfilesEnabled() &&
+         !IsUserSessionBlocked();
+}
+
+bool IsMultiAccountSupportedAndUserActive() {
+  return Shell::GetInstance()->delegate()->IsMultiAccountEnabled() &&
+         !IsUserSessionBlocked();
+}
+
+}  // namespace tray
+}  // namespace ash