cros: Use SessionController to enable system tray settings / notifications tray

ash/session/session_controller.cc

 // Copyright 2016 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/session/session_controller.h"
 
 #include <algorithm>
 
 #include "ash/session/session_state_observer.h"
 #include "ash/shell.h"
@@ skipping 78 matching lines @@
 }
 
 bool SessionController::IsInSecondaryLoginScreen() const {
   return state_ == SessionState::LOGIN_SECONDARY;
 }
 
 SessionState SessionController::GetSessionState() const {
   return state_;
 }
 
+bool SessionController::ShouldEnableSettings() const {
+  // Settings opens a web UI window, so it is not available at the lock screen.
+  if (!IsActiveUserSessionStarted() || IsScreenLocked() ||
+      IsInSecondaryLoginScreen()) {
+    return false;
+  }
+
+  return user_sessions_[0]->should_enable_settings;
+}
+
+bool SessionController::ShouldShowNotificationTray() const {
+  if (!IsActiveUserSessionStarted() || IsInSecondaryLoginScreen())
+    return false;
+
+  return user_sessions_[0]->should_show_notification_tray;
+}
+
 const std::vector<mojom::UserSessionPtr>& SessionController::GetUserSessions()
     const {
   return user_sessions_;
 }
 
 const mojom::UserSession* SessionController::GetUserSession(
     UserIndex index) const {
   if (index < 0 || index >= static_cast<UserIndex>(user_sessions_.size()))
     return nullptr;
 
@@ skipping 200 matching lines @@
   const LoginStatus new_login_status = CalculateLoginStatus();
   if (new_login_status == login_status_)
     return;
 
   login_status_ = new_login_status;
   for (auto& observer : observers_)
     observer.LoginStatusChanged(login_status_);
 }
 
 }  // namespace ash