[webkit-reviews] review requested: [Bug 70861] [MutationObservers] Support attributeOldValue for attribute mutations : [Attachment 112784] Patch

[bugzilla-daemon at webkit.org]

Adam Klein <adamk at chromium.org> has asked  for review:
Bug 70861: [MutationObservers] Support attributeOldValue for attribute
mutations
https://bugs.webkit.org/show_bug.cgi?id=70861

Attachment 112784: Patch
https://bugs.webkit.org/attachment.cgi?id=112784&action=review