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This converts the two test suites from 'script' tests to
'generated_script' tests, pushing more of the command line logic
into GN targets (and the generated wrapper scripts).

Bug: 816629
Change-Id: I0ebca0c54d61c6c60734147ebfef1673bd262ed7
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2462623Reviewed-by: Robert Ma <robertma@chromium.org>
Reviewed-by: Ben Pastene <bpastene@chromium.org>
Commit-Queue: Dirk Pranke <dpranke@google.com>
Cr-Commit-Position: refs/heads/master@{#815648}