I'm sure that made sense to somebody.
The weight that chrome plating will add will be negligible. You'll notice zero difference in acceleration between chrome and non-chrome rims.
As for moving up from a different wheel diameter to 19s, there could be a difference in acceleration depending on how you handle tire size. By reducing your sidewall height, the overall wheel/tire diameter could remain the same, resulting in nearly identical acceleration numbers. Your unsprung weight will increase if your new wheel/tire combination is heavier, but I'd bet you'd never notice the difference on the butt dyno. In the quarter mile, 100lbs = .10 of a second. If your new wheel tire combo added 50 lbs to your car,(unlikely) your quarter mile time would be increased by .05 seconds. You'd never feel that difference on the street.
Go to Tirerack.com for a good explanation of Plus 1 and Plus 2 wheel/tire sizing.