Towards upstreaming the iOS concept of render theme decorations, we should rename RenderTheme::paintMenuListButton() to RenderTheme::paintMenuListButtonDecorations() to better describe its purpose - to paint the menu list button on top of the CSS-specified border and background.
Created attachment 218356 [details] Patch
Committed r160113: <http://trac.webkit.org/changeset/160113>
Committed Apple Windows build fix in <http://trac.webkit.org/changeset/160114>.