RenderThemeIOS::cssValueToSystemColorMap() does an unnecessary linear search under systemColorFromCSSValueID(). cssValueToSystemColorMap() already has the selector, yet it passes a CSSValueID to systemColorFromCSSValueID() which then does a linear search to match the CSSValueID to a selector.
Created attachment 402303 [details] Patch
<rdar://problem/64540057>
Created attachment 402304 [details] Patch
Committed r263282: <https://trac.webkit.org/changeset/263282> All reviewed patches have been landed. Closing bug and clearing flags on attachment 402304 [details].