[Webkit-unassigned] [Bug 122809] New: Remove an extra relayout for non-percent logical height grid items

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=122809

           Summary: Remove an extra relayout for non-percent logical
                    height grid items
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: Unspecified
        OS/Version: Unspecified
            Status: NEW
          Keywords: BlinkMergeCandidate
          Severity: Normal
          Priority: P2
         Component: Layout and Rendering
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: rniwa at webkit.org
                CC: hyatt at apple.com, bdakin at apple.com,
                    simon.fraser at apple.com, dino at apple.com


Consider merging https://chromium.googlesource.com/chromium/blink/+/ae5ced7c567303966c1fa5e365e8d7ab737a030a

The only reason for a grid item to force a relayout after a grid
area's logical height change is if it has a percentage height. In
all other cases, this would cause an unneeded relayout. Note that
changing the logical width still forces a relayout as the situation
is not that simple.

This improves auto-grid-lots-of-data.html from 94 runs/s to 226
runs/s as we avoid a relayout in layoutGridItems for every grid
items.

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