If I set up a variations configuration with a matching flag to go into a forced experiment, I don't see the variation on chrome://version.

e.g. if the configuration has...
{
  "study": {
    "name": "Foo"
  }
  "experiments": [
    {
      "name": "ForcedByFlag",
      "forcing_flag": "foo-flag"
    }
  ]
}

And I launch Chrome with --foo-flag, 
Foo:ForcedByFlag
should appear in the Variations section of chrome://version