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Makes the VR bisect compatible with both the old method of running perf
tests (directly calling run_benchmark) and the new method (calling
run_performance_tests). Which method to use is dynamically chosen based
on the current commit's position relative to the CL that changed which
format the VR tests use on swarming.

Bug: 865533
Change-Id: I235c59c8df2f340c0d9407f0b204d65e74eea18a
Reviewed-on: https://chromium-review.googlesource.com/1178625Reviewed-by: Tibor Goldschwendt <tiborg@chromium.org>
Commit-Queue: Brian Sheedy <bsheedy@chromium.org>
Cr-Commit-Position: refs/heads/master@{#584125}