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

ash/test/test_shell_delegate.h

Index: ash/test/test_shell_delegate.h
diff --git a/ash/test/test_shell_delegate.h b/ash/test/test_shell_delegate.h
index 986a3ab058b4b2ca29d1f9e34b36eded06bff3b8..975c91ebb9cd5fee1db2f924e8040b5f272138f5 100644
--- a/ash/test/test_shell_delegate.h
+++ b/ash/test/test_shell_delegate.h
@@ -20,7 +20,7 @@ class TestShellDelegate : public ShellDelegate {
   virtual ~TestShellDelegate();
 
   // Overridden from ShellDelegate:
-  virtual bool IsUserLoggedIn() OVERRIDE;
+  virtual bool IsUserLoggedIn() const OVERRIDE;
   virtual bool IsSessionStarted() OVERRIDE;
   virtual bool IsFirstRunAfterBoot() OVERRIDE;
   virtual void LockScreen() OVERRIDE;