function setMacFontSmoothingType(aaType) {
        var $editor_holder  = $("#editor-holder");

        // Add/Remove the class based on the preference. Also
        // default to subpixel AA in case of invalid entries.
        if (aaType === "antialiased") {
            $editor_holder.removeClass("subpixel-aa");
        } else {
            $editor_holder.addClass("subpixel-aa");
        }
    }
Font smoothing setter to set the anti-aliasing type for the code area on Mac.
@param {string} aaType The antialiasing type to be set. It can take either "subpixel-antialiased" or "antialiased"