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This is what Simple Chrome does today:
https://source.chromium.org/chromium/chromium/src/+/master:third_party/chromite/cli/cros/cros_chrome_sdk.py;l=1008

Setting a proper default here will let us delete that bit from
cros_chrome_sdk.

Bug: 937821
Change-Id: Ic83983c75f392a93256dc9cb278bbbf16081e4fb
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2015822Reviewed-by: George Burgess <gbiv@chromium.org>
Reviewed-by: Nico Weber <thakis@chromium.org>
Commit-Queue: Ben Pastene <bpastene@chromium.org>
Cr-Commit-Position: refs/heads/master@{#735028}