I tried to add "git cl checkout --print" in https://chromium-review.googlesource.com/804614 but agable@ said to use "git cl issue -r" instead. Then I tried it in my Chromium checkout, which has many branches, new and old. It doesn't work though:

$ git cl issue -r 804205
Traceback (most recent call last):
  File "/home/thestig/depot_tools/git_cl.py", line 6193, in <module>
    sys.exit(main(sys.argv[1:]))
  File "/home/thestig/depot_tools/git_cl.py", line 6175, in main
    return dispatcher.execute(OptionParser(), argv)
  File "/home/thestig/depot_tools/subcommand.py", line 252, in execute
    return command(parser, args[1:])
  File "/home/thestig/depot_tools/git_cl.py", line 4540, in CMDissue
    cl = Changelist(branchref=branch)
  File "/home/thestig/depot_tools/git_cl.py", line 1146, in __init__
    assert branchref.startswith('refs/heads/')
AssertionError

The first branch I have is named "autofill_b446322" and that's what |branchref| is. It's a branch that's at 6334aa835e879d9e025679d276f48149ba97b665 - I never actually got around to writing any code for bug 446322 and just left the branch sitting there.