Looking at the "vm." tunings starting at:

https://chromium.googlesource.com/chromiumos/overlays/chromiumos-overlay/+/master/chromeos-base/chromeos-base/files/00-sysctl.conf#82

I see:

> # Protect working set in order to avoid thrashing.
> # See http://crosbug.com/7561 for details.
> vm.min_filelist_kbytes = 50000
> 
> # Allow full memory overcommit as we rather close or kill tabs than
> # refuse memory to arbitrary core processes.
> vm.overcommit_memory = 1
> 
> vm.dirty_background_ratio = 5
> vm.dirty_expire_centisecs = 60000
> vm.dirty_ratio = 60
> vm.dirty_writeback_centisecs = 60000
> vm.laptop_mode = 0
>
> # Disable swap read-ahead
> vm.page-cluster = 0

At least one of those settings came from:

  http://codereview.chromium.org/4124009

That CL (from 2010) starts out:

> On ChromiumOS, we do not use swap. When memory is low, the only way to


...well, that's not really true anymore.  We use zram now.

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No idea if this matters, but I figured I'd at least file...