I believe the real issue is lack of USB support in the Linux environment of Chrome OS.
For storage devices you can allow access to the device from the Chrome OS files application (right click on the device and select Share with Linux). This allows access to the file system at /mnt/chromeos/removable/KOBOeReader/ . However lsusb does not show any USB devices as being connected.
Now within the Chrome OS settings for Linux (Beta) there is an option "Manage USB devices" which is meant to "Give Linux apps permission to access USB devices. Only supported devices are shown", the attached Kobo is not shown. Somehow I think that mass storage class devices will not appear here.
And before someone chimes in, yes, when the Kobo is connected to the Chromebook the prompt IS displayed to connect to the device.
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