[Webkit-unassigned] [Bug 124408] New: [CSS Grid Layout] Improve content-sized track layout

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=124408

           Summary: [CSS Grid Layout] Improve content-sized track layout
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: Unspecified
        OS/Version: Unspecified
            Status: NEW
          Keywords: BlinkMergeCandidate
          Severity: Normal
          Priority: P2
         Component: CSS
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: svillar at igalia.com
            Blocks: 123989


Bug 124039 improves the performance of the grid layouting by not running the autoplacement algorithm for non content-sized tracks. But we can also improve the performance for content-sized tracks by narrowing down the relayout conditions. This change involves merging:

    [CSS Grid Layout] Speed up content sized track layout

    This change narrows down the relayout condition in
    RenderGrid::logicalContentHeightForChild to only
    percentage children: as they are the only lengths that
    depends on the containing block's override. We
    unfortunately can't use percentHeightDescendants as
    it's not populated yet. This code can probably be
    simplified further down but it's a good start.

    This greatly speeds up the new performance test, moving
    from 25 runs/sec to 91 runs/sec.

    BUG=234211
    Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=156122

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