There's active disdain (or at least snide jokes) among the senior Waymo engineers for the approach to autonomous driving taken by Tesla. I can't see a partnership in the cards, probably ever.
Source: used to work there
Source: used to work there
[1] https://www.cnbc.com/2018/02/08/a-tesla-self-driving-blind-s...
Source: Watched a presentation on the computational aspects recently.