Verified that it works on Chrome 78. We will need to change the observer syntax that was used for the origin trial. Aside from that, with simulated slow 3G unsurprisingly time-to-first-paragraph == FCP:
Time to first paragraph = FCP = First paint for us. I wonder if we have some pages where that isn't true? When we had the short discussion last week I think missed out that there are some value in LCP: If theres a diff between LCP and FCP? Today we only have measurement when things starts to paint, would be cool to have something latest contentful paint (instead of largest) :)
This is precisely to figure out if there is a meaningful difference in practice. I don't think there would be, I expect that the first paragraph is almost always included in the first paint for us.