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Increases the timeout of VR tests running on Nougat to 30 minutes (from
16). The number of tests has grown to the point where 16 minutes can
end up being flaky. The number should go back down eventually once WebVR
is completely replaced by WebXR, but that's still a ways off.

Bug: 812306
Change-Id: Ia3b74c8f11c524b3b01121e8842e1051692efce0
Reviewed-on: https://chromium-review.googlesource.com/920661
Commit-Queue: Brian Sheedy <bsheedy@chromium.org>
Reviewed-by: Kenneth Russell <kbr@chromium.org>
Cr-Commit-Position: refs/heads/master@{#537157}