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This is to prepare for running the scanner as a presubmit check.

I have added some manual tests to make sure that the new scanner is
compatible with the old one. I plan to replace them with automatic
unittests once I start using presubmit-style input API objects that
are easily mockable.

BUG=343104

Review URL: https://codereview.chromium.org/622493004

Cr-Commit-Position: refs/heads/master@{#297828}