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Adds code to the VR Telemetry benchmarks to support the copying of the
VR browsing assets that are normally downloaded via component updater
onto the device before each story run. This allows the assets to be used
without actually downloading anything.

Bug: 808465
Cq-Include-Trybots: master.tryserver.chromium.linux:closure_compilation
Change-Id: I320c14e16eb411dd0bf29c57a330e3825fe4dcd6
Reviewed-on: https://chromium-review.googlesource.com/938398
Commit-Queue: Brian Sheedy <bsheedy@chromium.org>
Reviewed-by: Tibor Goldschwendt <tiborg@chromium.org>
Cr-Commit-Position: refs/heads/master@{#539983}