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Add VR auto bisect script

Adds a Python script for automatically bisecting VR perf regressions.
This is a temporary solution while we wait for automatic bisects on the
perf dashboard to support devices outside of the Telemetry lab. This is
only meant to run on a developer's workstation, not as part of any
automatation/on bots/etc.

Change-Id: I6887210cc2d83823c4a09efc9b5581578f5d1c7e
Reviewed-on: https://chromium-review.googlesource.com/894283Reviewed-by: Christopher Grant <cjgrant@chromium.org>
Reviewed-by: Tibor Goldschwendt <tiborg@chromium.org>
Commit-Queue: Brian Sheedy <bsheedy@chromium.org>
Cr-Commit-Position: refs/heads/master@{#533107}