Looks like that's my fault. The Canute isn't using the Arduino's USB ID, rather I was testing a build of the Canute firmware running on an Arduino and incorrectly used those ids in the experimental driver assuming they were for the Canute.

I'll remove those IDs.

Thank you!

We've formally announced availability of the Arduino Create Chrome app (https://blog.arduino.cc/2017/07/17/arduino-create-comes-to-chrome-os-devices/) and mentioned Leonardo board support will be restored in a later Chrome OS release.

I've been talking to the guys from Arduino and glad to have cleared up the confusion. Canute is an unreleased product not illegally using the Arduino ID. I hope this is able to be quickly resolved within Chromium so the Arduino Create app can have Leonardo support reinstated. Cheers, Ed (Bristol Braille Tech.)

The following revision refers to this bug:
  https://chromium.googlesource.com/chromiumos/overlays/chromiumos-overlay/+/0ce5efe415dc2ac320cb0cf9ad957715ed32968a

commit 0ce5efe415dc2ac320cb0cf9ad957715ed32968a
Author: Dominic Mazzoni <dmazzoni@chromium.org>
Date: Sat Sep 09 00:36:10 2017

Remove Canute braille display support.

The Canute driver was experimental only, so this won't affect users.
The driver was incorrectly identifying Arduino Leonardo as Canute,
which *was* affecting users. We need to fix that before re-landing.

BUG= chromium:739176 
TEST=Manually test Canute no longer triggers spoken feedback

Change-Id: I94d6365440da50f2ebd10aef0ff95b214438271f
Reviewed-on: https://chromium-review.googlesource.com/648093
Commit-Ready: Dominic Mazzoni <dmazzoni@chromium.org>
Tested-by: Dominic Mazzoni <dmazzoni@chromium.org>
Reviewed-by: David Tseng <dtseng@chromium.org>
Reviewed-by: Mike Frysinger <vapier@chromium.org>

[rename] https://crrev.com/0ce5efe415dc2ac320cb0cf9ad957715ed32968a/app-accessibility/brltty/brltty-5.4-r5.ebuild
[modify] https://crrev.com/0ce5efe415dc2ac320cb0cf9ad957715ed32968a/app-accessibility/brltty/brltty.bashrc
[delete] https://crrev.com/718b26d922fb0ee5edbd6e8f1390a58dd53c3be8/app-accessibility/brltty/files/brltty-5.4-canute.patch

Requesting merge to 62 because this is affecting Arduino Leonardo users.

LGTM for 62.

This issue has been approved for a merge. Please merge the fix to any appropriate branches as soon as possible!

If all merges have been completed, please remove any remaining Merge-Approved labels from this issue.

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For more details visit https://www.chromium.org/issue-tracking/autotriage - Your friendly Sheriffbot

This issue has been approved for a merge. Please merge the fix to any appropriate branches as soon as possible!

If all merges have been completed, please remove any remaining Merge-Approved labels from this issue.

Thanks for your time! To disable nags, add the Disable-Nags label.

For more details visit https://www.chromium.org/issue-tracking/autotriage - Your friendly Sheriffbot

The following revision refers to this bug:
  https://chromium.googlesource.com/chromiumos/overlays/chromiumos-overlay/+/46c741aba361853d3745ce38ea5816f06f623451

commit 46c741aba361853d3745ce38ea5816f06f623451
Author: Dominic Mazzoni <dmazzoni@chromium.org>
Date: Thu Sep 21 18:55:16 2017

Merge to R62: Remove Canute braille display support.

The Canute driver was experimental only, so this won't affect users.
The driver was incorrectly identifying Arduino Leonardo as Canute,
which *was* affecting users. We need to fix that before re-landing.

BUG= chromium:739176 
TEST=Manually test Canute no longer triggers spoken feedback

Change-Id: I94d6365440da50f2ebd10aef0ff95b214438271f
Reviewed-on: https://chromium-review.googlesource.com/648093
Commit-Ready: Dominic Mazzoni <dmazzoni@chromium.org>
Tested-by: Dominic Mazzoni <dmazzoni@chromium.org>
Reviewed-by: David Tseng <dtseng@chromium.org>
Reviewed-by: Mike Frysinger <vapier@chromium.org>
(cherry picked from commit 0ce5efe415dc2ac320cb0cf9ad957715ed32968a)
Reviewed-on: https://chromium-review.googlesource.com/676753
Reviewed-by: Dominic Mazzoni <dmazzoni@chromium.org>
Commit-Queue: Dominic Mazzoni <dmazzoni@chromium.org>

[rename] https://crrev.com/46c741aba361853d3745ce38ea5816f06f623451/app-accessibility/brltty/brltty-5.4-r5.ebuild
[modify] https://crrev.com/46c741aba361853d3745ce38ea5816f06f623451/app-accessibility/brltty/brltty.bashrc
[delete] https://crrev.com/6d40f741e12c0adbdf62fd34ba4326bf319e61f0/app-accessibility/brltty/files/brltty-5.4-canute.patch

This issue hasn't been updated in the last 6 weeks, so removing its merge approval label. Please re-request a merge if needed.

For more details visit https://www.chromium.org/issue-tracking/autotriage - Your friendly Sheriffbot

Confirmed fixed, I updated my Chromebook to Chrome OS 62 and the Leonardo serial port is listed again. Thanks!