We used to have issues because launcher/shelf were in different processes (ash/browser) and it was hard to tell shelf when the launcher animation was over.

We should be able to do this better now that we are in the same process. Also we should probably look at launcher animation speed vs shelf animation speed.

Currently launcher animations animate from peeking/half to the bottom at 200ms, and from fullscreen to the bottom in 250ms.

UX: Should we animate over a constant speed instead of these arbitrary values?

I think the idea behind these two values was to get more steps in between the peeking mode and the fullscreen, as the distance was longer,  15 frames looking a bit better than 12. 

I'm not sure I'm getting the correlation between these numbers and what is shown here as these number apply only to launcher and not shelf. What's the curent timing for shelf hiding back down?

Fixed in top of tree[1]. Shelf doesn't get its background until the launcher reaches shelf height. 

Constant speed questions were covered with mccanny offline.

We decided not to pursue this because the gains were pretty negligible. (willing to talk more offline if you're interested.)


[1] https://chromium-review.googlesource.com/c/chromium/src/+/1370368