Automatic Autoprefixer feature on Custom Styles

I know this isn't the most elegant solution for the (custom styles) autoprefixer case, but for me it works great! If you guys have a nicer solution, please teach me so I can do better! I know too that this is not the right place to put a autoprefixer service. (because this is a combiner task file). But it works so beautiful, sorry that the code looks inconsistent and so ugly.