[webkit-reviews] review requested: [Bug 75638] Unnecessary and incorrect invalidation about composited fixed-position layers : [Attachment 121380] patch

[bugzilla-daemon at webkit.org]

Xianzhu Wang <wangxianzhu at chromium.org> has asked  for review:
Bug 75638: Unnecessary and incorrect invalidation about composited
fixed-position layers
https://bugs.webkit.org/show_bug.cgi?id=75638

Attachment 121380: patch
https://bugs.webkit.org/attachment.cgi?id=121380&action=review