This ControlPart will handle drawing the button and background of the MenuList if the zoomFactor != 100% (i.e. <select style="zoom: 200%;">...</select>). For macOS, the GraphicsContext APIs will be used to draw the platform control.
<rdar://problem/103803444>
Pull request: https://github.com/WebKit/WebKit/pull/8120
Committed 258644@main (5a3f07e17bd7): <https://commits.webkit.org/258644@main> Reviewed commits have been landed. Closing PR #8120 and removing active labels.