Chrome	67.0.3396.49 (Official Build) beta (64-bit)
Revision	5b1d0ea887316c0d486d1df5572e04d7813976a1-refs/branch-heads/3396@{#612}
Platform	10575.40.0 (Official Build) beta-channel eve
Firmware Version	Google_Eve.9584.145.0

What steps will reproduce the problem?
(1) Open 9 tabs.
(2) Notice that the tabs overlap on the side.
(3) Open 5 more tabs
(4) Notice that there's a ton of overlapping tabs.
(5) Try to scroll over to those tabs with the mouse or trackpad 2 finger scroll.

What is the expected result?

I should be able to scroll sideways with the trackpad same as I can with touching the screen. Also the tab strip bounces, but it has no velocity when touching the screen which is weird.

What happens instead?

I can apparently slide the tabs sideways by touching the screen, but there's no way to do it without touching the screen. Touching the collapsed stack of tabs also changes to the tab you click, even though you can't see anything about it.

This is a regression. I used to be able to have a lot more tabs open on a Pixelbook before they became unstably small. It's not clear why they don't overlap a little on the edges before going into tiny slivers either.

There's a couple bugs here:
- Tab strip is not scrollable with the trackpad (users should never be forced to touch the screen).
- Tab strip doesn't scroll with velocity but does bounces.
- Tab strip doesn't show as many tabs as it used to so even moderate users are forced to scroll.