See: https://cs.chromium.org/chromium/src/third_party/catapult/telemetry/telemetry/internal/browser/browser_options.py?rcl=e50cee06e2ae2dcc0f070dbf07e1a4b4bde63033&l=210

This has lead to a subtle bug when csharrison@ try to submit his CL in https://chromium-review.googlesource.com/c/chromium/src/+/1054590

We should find way to make parsing commandline args side effect free.