GPU render stylus mixin

gpuRender.styl

//
// render in separate layer
// hack to balance CPU/GPU load
// usage gpuRender(chrome, mac-chrome)
gpuRender($browsers){
    $i = 0;
    $comma = ",";
    $rule = "";

    for $b in arguments {
        $i += 1;
        if ($i == length(arguments)){
            $comma = "";
            }

        $rule += unquote(".") + $b + unquote(" &") + unquote($comma);
        }

    {$rule} {
        backface-visibility: hidden;
        }
    }