So, short term, I'm considering just ignoring --cc flags/codereview.settings when doing Gerrit upload (essentially reverting progress in issue 323819).
Long term, I hope we can make this possible in Gerrit.

https://codereview.chromium.org/1895863002

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/tools/depot_tools.git/+/0b2d70724f1319bf251e14d4c223f2dd7fc2090d

commit 0b2d70724f1319bf251e14d4c223f2dd7fc2090d
Author: tandrii@chromium.org <tandrii@chromium.org>
Date: Mon Apr 18 16:19:03 2016

Gerrit git cl: temporary disable cc option on upload.

Gerrit doesn't allow arbitrary non-member emails for now,
thus removign this feature until either Gerrit allows it,
or we have a per-repo opt-in way.

TBR=andybons@chromium.org
BUG= 604377 

Review URL: https://codereview.chromium.org/1895863002

git-svn-id: svn://svn.chromium.org/chrome/trunk/tools/depot_tools@299988 0039d316-1c4b-4281-b951-d872f2087c98

[modify] https://crrev.com/0b2d70724f1319bf251e14d4c223f2dd7fc2090d/git_cl.py
[modify] https://crrev.com/0b2d70724f1319bf251e14d4c223f2dd7fc2090d/tests/git_cl_test.py

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/tools/build.git/+/776aa9a9bcd27495c8595855f3a2dbab51907aec

commit 776aa9a9bcd27495c8595855f3a2dbab51907aec
Author: recipe-roller@chromium.org <recipe-roller@chromium.org>
Date: Mon Apr 18 16:28:30 2016

Roll recipe dependencies (trivial).

This is an automated CL created by the recipe roller. This CL rolls recipe
changes from upstream projects (e.g. depot_tools) into downstream projects
(e.g. tools/build).


More info is at https://goo.gl/zkKdpD. Use https://goo.gl/noib3a to file a bug
(or complain)

depot_tools:
  https://crrev.com/0b2d70724f1319bf251e14d4c223f2dd7fc2090d Gerrit git cl: temporary disable cc option on upload. (tandrii@chromium.org)

R=andybons@chromium.org,tandrii@chromium.org
BUG= 604377 

TBR=martiniss@chromium.org,phajdan.jr@chromium.org

Review URL: https://codereview.chromium.org/1899793002

git-svn-id: svn://svn.chromium.org/chrome/trunk/tools/build@299989 0039d316-1c4b-4281-b951-d872f2087c98

[modify] https://crrev.com/776aa9a9bcd27495c8595855f3a2dbab51907aec/infra/config/recipes.cfg

The following revision refers to this bug:
  http://goto.ext.google.com/viewvc/chrome-internal?view=rev&revision=86731

------------------------------------------------------------------
r86731 | recipe-roller@chromium.org | 2016-04-18T17:23:40.890584Z

-----------------------------------------------------------------

Andy, can you post here a url of bug for implementing arbitrary CC in Gerrit so it's obvious what this issue is blocked on?

Here you go: https://code.google.com/p/gerrit/issues/detail?id=4134

The revert https://codereview.chromium.org/2034143002/ of previously landed CL to temporary disable using cc= when uploading has to land for this issue to be closed.

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/tools/depot_tools.git/+/074c2afe947dadad6d3853be6b9b2b6f8a0a3fdf

commit 074c2afe947dadad6d3853be6b9b2b6f8a0a3fdf
Author: tandrii@chromium.org <tandrii@chromium.org>
Date: Fri Jun 03 23:18:40 2016

Revert of Gerrit git cl: temporary disable cc option on upload. (patchset #1 id:1 of https://codereview.chromium.org/1895863002/ )

Reason for revert:
We've whitelisted cc-ed emails in Gerrit, and so let's try setting cc= again.

Original issue's description:
> Gerrit git cl: temporary disable cc option on upload.
> 
> Gerrit doesn't allow arbitrary non-member emails for now,
> thus removign this feature until either Gerrit allows it,
> or we have a per-repo opt-in way.
> 
> TBR=andybons@chromium.org
> BUG= 604377 
> 
> Committed: http://src.chromium.org/viewvc/chrome?view=rev&revision=299988

TBR=andybons@chromium.org,sergiyb@chromium.org
# Not skipping CQ checks because original CL landed more than 1 days ago.
BUG= 604377 

Review-Url: https://codereview.chromium.org/2034143002

git-svn-id: svn://svn.chromium.org/chrome/trunk/tools/depot_tools@300694 0039d316-1c4b-4281-b951-d872f2087c98

[modify] https://crrev.com/074c2afe947dadad6d3853be6b9b2b6f8a0a3fdf/git_cl.py
[modify] https://crrev.com/074c2afe947dadad6d3853be6b9b2b6f8a0a3fdf/tests/git_cl_test.py

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/tools/build.git/+/22f19f3f7605bce47d2685f508626e93885dd4ec

commit 22f19f3f7605bce47d2685f508626e93885dd4ec
Author: recipe-roller <recipe-roller@chromium.org>
Date: Fri Jun 03 23:26:32 2016

Roll recipe dependencies (trivial).

This is an automated CL created by the recipe roller. This CL rolls recipe
changes from upstream projects (e.g. depot_tools) into downstream projects
(e.g. tools/build).

More info is at https://goo.gl/zkKdpD. Use https://goo.gl/noib3a to file a bug
(or complain)

depot_tools:
  https://crrev.com/074c2afe947dadad6d3853be6b9b2b6f8a0a3fdf Revert of Gerrit git cl: temporary disable cc option on upload. (patchset #1 id:1 of https://codereview.chromium.org/1895863002/ ) (tandrii@chromium.org)

R=sergiyb@chromium.org,andybons@chromium.org,tandrii@chromium.org
BUG= 604377 

TBR=martiniss@chromium.org,phajdan.jr@chromium.org

Review-Url: https://codereview.chromium.org/2039663002

[modify] https://crrev.com/22f19f3f7605bce47d2685f508626e93885dd4ec/infra/config/recipes.cfg

The following revision refers to this bug:
  https://chrome-internal.googlesource.com/chrome/tools/build_limited/scripts/slave/+/24d5d21612bdaf1b17b4ef7b87c9ff682acfe748

commit 24d5d21612bdaf1b17b4ef7b87c9ff682acfe748
Author: recipe-roller <recipe-roller@chromium.org>
Date: Fri Jun 03 23:48:52 2016