(cherry picked from commit 26aa1238)

Please note: ATK support in Chromium needs much work. Until that work has
been done, Orca will not be able to provide access to Chromium. This
script is very much a work in progress and not yet ready for end-user
testing.

We need to search for unrelated labels for menu items in gnome-shell
extensions because they don't have names like normal menu items.

* We also should interrupt braille flash messages
* It gives scripts the option of not doing the interruption