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This was reverted due to the tests breaking on debug builds. This should
be fixed with crrev.com/c/914860.

Original description:

Adds the VR browser tests to win7_chromium_rel_ng now that there
is enough capacity to run them on changes that affect VR.

Bug: 780668
Cq-Include-Trybots: master.tryserver.chromium.android:android_optional_gpu_tests_rel;master.tryserver.chromium.linux:linux_optional_gpu_tests_rel;master.tryserver.chromium.mac:mac_optional_gpu_tests_rel;master.tryserver.chromium.win:win_optional_gpu_tests_rel
Change-Id: I79bab14433da47464b58115ff61c893a7cbe29fa
Reviewed-on: https://chromium-review.googlesource.com/916842
Commit-Queue: Brian Sheedy <bsheedy@chromium.org>
Reviewed-by: Kenneth Russell <kbr@chromium.org>
Cr-Commit-Position: refs/heads/master@{#536778}