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Add the -d, --checkout-dir option to specify a different directory. This
helps especially when generating graphs at previous commits.

Change-Id: I5d4a107a85d6e2ecc4cbb884d8d1fab8ee31d2db
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2518790Reviewed-by: Mohamed Heikal <mheikal@chromium.org>
Commit-Queue: Henrique Nakashima <hnakashima@chromium.org>
Cr-Commit-Position: refs/heads/master@{#823765}