Not having implemented this, tests like this one fail: performance-timeline/po-observe-type.any.html
Created attachment 405911 [details] Patch
Created attachment 405923 [details] Patch
<rdar://problem/66529156>
Comment on attachment 405923 [details] Patch View in context: https://bugs.webkit.org/attachment.cgi?id=405923&action=review > Source/WebCore/page/PerformanceObserver.h:76 > + bool m_typeObserver { false }; This doesn’t seem to be a great name for a boolean. It sounds like the contents would be a "type observer", which sounds like an object, not a boolean. Maybe m_isTypeObserver?
Created attachment 405990 [details] Patch
Committed r265281: <https://trac.webkit.org/changeset/265281> All reviewed patches have been landed. Closing bug and clearing flags on attachment 405990 [details].