[Webkit-unassigned] [Bug 119717] New: [CSS Grid Layout] 2 span positions are not resolved correctly

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=119717

           Summary: [CSS Grid Layout] 2 span positions are not resolved
                    correctly
           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,
                    jchaffraix at webkit.org, simon.fraser at apple.com,
                    dino at apple.com


Consider merging https://chromium.googlesource.com/chromium/blink/+/2245e6b85adf3c96ef9b34dc6c92d736aaba2aac

The resolution code in resolveGridPositionsFromStyle had a bug where
we would check for 2 'auto' positions to determine if we needed to
run the auto-placement algorithm. However the specification considers
other positions as being treat as 'auto' depending on the context.
Due to this glitch, we would try to explicitly resolve a 'span'
position yielding to ASSERTs and the wrong result.

While touching some grid parsing tests, added a real grid container
so they now also test the resolution code path. Also removed some
unneeded internal overrides.

TEST=grid-item-bad-resolution-double-span.html

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