[webkit-reviews] review requested: [Bug 89722] Implement undoManager's undo, redo, length, position, clearUndo, and clearRedo : [Attachment 157100] Patch

[bugzilla-daemon at webkit.org]

Sukolsak Sakshuwong <sukolsak at google.com> has asked  for review:
Bug 89722: Implement undoManager's undo, redo, length, position, clearUndo, and
clearRedo
https://bugs.webkit.org/show_bug.cgi?id=89722

Attachment 157100: Patch
https://bugs.webkit.org/attachment.cgi?id=157100&action=review