no way to configure keyboard using Chromebook mapping

/usr/share/X11/xkb/symbols/inet includes the key mapping tweaks required by Chromebook keyboards. I can confirm that they are correct by appending them to the /usr/share/X11/xkb/symbols/pc file and restarting. But I can find no way to choose "Chromebook" as my keyboard type or layout. I looked through all of the options provided by `sudo dpkg-reconfigure keyboard-configuration` and the Text Entry System Settings.

Ubuntu 16.04 has come a very long way in supporting Chromebooks out of box, and Ubuntu is even easy to install on these machines. There are just a couple details like this and it'll be a seamless out-of-box experience!

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: keyboard-configuration 1.108ubuntu15.2
ProcVersionSignature: Ubuntu 4.4.0-34.53-generic 4.4.15
Uname: Linux 4.4.0-34-generic x86_64
ApportVersion: 2.20.1-0ubuntu2.1
Architecture: amd64
CurrentDesktop: Unity
Date: Sun Aug 28 10:17:07 2016
InstallationDate: Installed on 2016-08-27 (0 days ago)
InstallationMedia: Ubuntu 16.04.1 LTS "Xenial Xerus" - Release amd64 (20160719)
PackageArchitecture: all
SourcePackage: console-setup
UpgradeStatus: No upgrade log present (probably fresh install)