For nearly his entire adult life, Matt Skiba has sung and played guitar in Alkaline Trio, a pop-punk outfit that is splendidly competent but reasonably polarizing — and not just in its native Chicago. Along the way, he also filled in for Tom DeLonge of Blink-182, those mall rock he-devils so mistrusted by punk purists. Alkaline’s style — heavily EQ’ed vocals, chugga-chugga power chords — isn’t for everyone, not even close.