Amazon is inking a deal with New York-based food delivery service "Olo." RBC Capital's Managing Director Mark Mahaney says this is a small bet by Amazon to work its way up the market share chain in food delivery. Mahaney says grocery is the only part of e-commerce that hasn't worked yet. While grocers are trying to tackle this, the meal-kit space is becoming crowded. Mahaney says as competition shakes out, he expects Blue Apron will be well-positioned to survive.