Re-enable VR cardboard tests

Re-enables the tests that were disabled in https://crrev.com/c/1417451
and https://crrev.com/1417532. These were though to be failing 100% of
the time on ToT, but turned out to be an issue with the local repro
environment not being set up properly for VR tests.

TBR=billorr@chromium.org

Bug: 897259
Change-Id: Ia8c1bd154231398774134ab701523e230c858681
Reviewed-on: https://chromium-review.googlesource.com/c/1418077
Reviewed-by: Brian Sheedy <bsheedy@chromium.org>
Commit-Queue: Brian Sheedy <bsheedy@chromium.org>
Cr-Commit-Position: refs/heads/master@{#623790}
7 files changed