[Webkit-unassigned] [Bug 273568] New: Avoid copying FontPallette and FontVariantAlternatives

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=273568

            Bug ID: 273568
           Summary: Avoid copying FontPallette and FontVariantAlternatives
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: WebCore Misc.
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: bfulgham at webkit.org

Reduce unnecessary copies in our font handling code:
(1) FontPalette is a struct containing an enum and an AtomString, and should be returned by const reference to avoid copying that string.
(2) FontVariantAlternatives is lightweight, containing only a `Markable`, but the `Markable` is holding a very heavy-weight object that contains Vectors of Strings, and Strings.

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