Tray elements behave appropriately on the multiple signin screen (more like lock screen)

ash/test/test_session_state_delegate.cc

 // Copyright (c) 2013 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/test/test_session_state_delegate.h"
 
 #include <algorithm>
 #include <string>
 
 #include "ash/session/user_info.h"
@@ skipping 216 matching lines @@
 }
 
 void TestSessionStateDelegate::AddSessionStateObserver(
     SessionStateObserver* observer) {
 }
 
 void TestSessionStateDelegate::RemoveSessionStateObserver(
     SessionStateObserver* observer) {
 }
 
+void TestSessionStateDelegate::HideMultiUserSigninScreen() {
+}
+
 }  // namespace test
 }  // namespace ash