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

ash/shell.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 ASH_SHELL_H_
 #define ASH_SHELL_H_
 
 #include <utility>
 #include <vector>
 
@@ skipping 382 matching lines @@
   ShellDelegate* delegate() { return delegate_.get(); }
 
   UserWallpaperDelegate* user_wallpaper_delegate() {
     return user_wallpaper_delegate_.get();
   }
 
   SessionStateDelegate* session_state_delegate() {
     return session_state_delegate_.get();
   }
 
+  // For testing only: set specific SessionStateDelegate
+  void SetSessionStateDelegateForTesting(
+      SessionStateDelegate* session_state_delegate);
+
   AccessibilityDelegate* accessibility_delegate() {
     return accessibility_delegate_.get();
   }
 
   NewWindowDelegate* new_window_delegate() {
     return new_window_delegate_.get();
   }
 
   MediaDelegate* media_delegate() {
     return media_delegate_.get();
@@ skipping 338 matching lines @@
 
   // Injected content::GPUDataManager support.
   scoped_ptr<GPUSupport> gpu_support_;
 
   DISALLOW_COPY_AND_ASSIGN(Shell);
 };
 
 }  // namespace ash
 
 #endif  // ASH_SHELL_H_