We would create and destroy the display with every test, as it
was not part of the environment.

BUG=angle:730

Change-Id: Iae003f13c8e975ae57d3af2d74f9f058a560046f
Reviewed-on: https://chromium-review.googlesource.com/213291Reviewed-by: Brandon Jones <bajones@chromium.org>
Tested-by: Jamie Madill <jmadill@chromium.org>
Reviewed-by: Geoff Lang <geofflang@chromium.org>