[Webkit-unassigned] [Bug 98734] New: enclosingLayer() walks the entire parent chain, making it slow for deep trees

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=98734

           Summary: enclosingLayer() walks the entire parent chain, making
                    it slow for deep trees
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: Unspecified
        OS/Version: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Layout and Rendering
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: eric at webkit.org
                CC: simon.fraser at apple.com, jamesr at chromium.org


enclosingLayer() walks the entire parent chain, making it slow for deep trees

It makes repaint/layout samples account for about 30% of:
http://www.robohornet.org/tests/descendantselector.html

(which I'm not suggesting is either a good or bad benchmark, merely one which triggers this condition.)

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