Chili's, like some other restaurants, are installing these tablets at their booths to have customers order from their table. According to sources,
"The tablets let your order your meal—and pay for it—through a screen, as you would with online ordering. (They also, as a bonus, offer games for kids and news offerings from USA Today.) Chili's just completed what it's calling "the largest rollout of tabletop tablets in the U.S."—which includes the installation of more than 45,000 tablets across 823 Chili's restaurants."
I once blogged on tipping pizza delivery persons fairly so I won't rehash this issue but only to say that anything less than a $5 tip for delivery is not going to cover the expenses of the driver to bring you your pizza. And that isn't good on a business order of $100. Ask any pizza delivery person who has received a $2 tip on that type of order.