[webkit-reviews] review requested: [Bug 74641] [MutationObservers] Add a document-level flag that can trivially be checked to avoid doing unnessary work if mutation observers absent : [Attachment 119486] Patch

[bugzilla-daemon at webkit.org]

Rafael Weinstein <rafaelw at chromium.org> has asked  for review:
Bug 74641: [MutationObservers] Add a document-level flag that can trivially be
checked to avoid doing unnessary work if mutation observers absent
https://bugs.webkit.org/show_bug.cgi?id=74641

Attachment 119486: Patch
https://bugs.webkit.org/attachment.cgi?id=119486&action=review