A11y: Add the option to always show the a11y tray menu regardless of the state of a11y features

ash/shell_delegate.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_DELEGATE_H_
 #define ASH_SHELL_DELEGATE_H_
 
 #include <vector>
 
 #include "ash/ash_export.h"
@@ skipping 49 matching lines @@
   UMA_TOUCHSCREEN_TAP_DOWN,
 };
 
 // Delegate of the Shell.
 class ASH_EXPORT ShellDelegate {
  public:
   // The Shell owns the delegate.
   virtual ~ShellDelegate() {}
 
   // Returns true if user has logged in.
-  virtual bool IsUserLoggedIn() = 0;
+  virtual bool IsUserLoggedIn() const = 0;
 
   // Returns true if we're logged in and browser has been started
   virtual bool IsSessionStarted() = 0;
 
   // Returns true if this is the first time that the shell has been run after
   // the system has booted.  false is returned after the shell has been
   // restarted, typically due to logging in as a guest or logging out.
   virtual bool IsFirstRunAfterBoot() = 0;
 
   // Returns true if a user is logged in whose session can be locked (i.e. the
@@ skipping 129 matching lines @@
   virtual aura::client::StackingClient* CreateStackingClient() = 0;
 
   // True if the user's preferences have the Search key acting as a Function key
   // modifier for accessing extended keyboard shortcuts.
   virtual bool IsSearchKeyActingAsFunctionKey() const = 0;
 };
 
 }  // namespace ash
 
 #endif  // ASH_SHELL_DELEGATE_H_