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This is required for the MVP builders, which will run a subset of the
WPT tests for Web Payments and Web Identity. It is also useful for local
users of the script, to let them not run the entire WPT test suite.

Bug: 1127055
Change-Id: I8142593a2afd9b2bcd94750765a3f626e5484310
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2412813
Commit-Queue: Stephen McGruer <smcgruer@chromium.org>
Reviewed-by: Luke Z <lpz@chromium.org>
Cr-Commit-Position: refs/heads/master@{#807567}