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Specifically this adds the --impls switch as a way of specifying the order to run verifiers.


To run the platform verifier and then the builtin verifier you would use:
  --impls=platform,builtin

To run just the builtin verifier:
  --impls=builtin

This is relevant when testing because there can be global sideffects for running the platform
verifier that affect the subsequent runs (notably NSS's temporary cache of intermediates).

Change-Id: I1cb47fff745f3ade03a4885803f9fdab2240f2e5
Reviewed-on: https://chromium-review.googlesource.com/1161394Reviewed-by: Matt Mueller <mattm@chromium.org>
Commit-Queue: Eric Roman <eroman@chromium.org>
Cr-Commit-Position: refs/heads/master@{#580376}