Currently, //third_party/autotest/files/server/site_tests/telemetry_Benchmarks/generate_controlfiles.py does not handle all desired situations. For example, we may need to run a group of rendering.desktop stories in a different browser session than another group like in https://chromium-review.googlesource.com/c/chromiumos/third_party/autotest/+/1378928.

Ideally, we wouldn't need to add control files manually. Instead, the generate_controlfiles.py should be able to handle that situation.