VoiceOver would like to be given a unique identifier for each web session. This would be used to allow VO's focus history to be cached on a per-window or per-tab basis. <rdar://problem/35950467>
Created attachment 331858 [details] patch
Created attachment 332092 [details] patch
Comment on attachment 332092 [details] patch Clearing flags on attachment: 332092 Committed r227526: <https://trac.webkit.org/changeset/227526>
All reviewed patches have been landed. Closing bug.