It doesn't need to inherit from MultiviewRenderTest since it doesn't
need a framebuffer.

BUG=angleproject:2765
TEST=angle_end2end_tests

Change-Id: I77b232a907afcae7f2f93cbf9da47ca7bd93c959
Reviewed-on: https://chromium-review.googlesource.com/1179881Reviewed-by: Geoff Lang <geofflang@chromium.org>
Commit-Queue: Olli Etuaho <oetuaho@nvidia.com>