[Webkit-unassigned] [Bug 118620] New: Use a Vector instead of HashSet to computed the orderValues in RenderFlexibleBox

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=118620

           Summary: Use a Vector instead of HashSet to computed the
                    orderValues in RenderFlexibleBox
           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, koivisto at iki.fi,
                    dino at apple.com, akling at apple.com


We should probably merge https://chromium.googlesource.com/chromium/blink/+/f8d1285399d9e1ee079e2babf4fd8c6f337855d7

Also, special-case the very much common case of only having the
default order value of 0.

This accounts for ~1% of the profile on flexbox-lots-of-data.html
from crbug.com/249986. Order is extremely uncommon. If there turn
out to be sites that use a large number of different order values,
then we have to rethink how we store this data (i.e. right now
we loop over all the flex items for each order value).

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