D3D11: Enable multiview performance tests
D3D11: Enable multiview performance tests

The patch adds D3D11 as a testable platform to the multiview performance
tests.

BUG=angleproject:2062
TEST=angle_perftests

Change-Id: I2266073860fd53f546ce9a414bc343b582c77f70
Reviewed-on: https://chromium-review.googlesource.com/645849
Reviewed-by: Olli Etuaho <38ae6c0e2772a20e8e989f80cb8c99d274e44242@nvidia.com>
Reviewed-by: Corentin Wallez <470c533e86f4f848c98c7e11fffc2d043494a401@chromium.org>
Commit-Queue: Corentin Wallez <470c533e86f4f848c98c7e11fffc2d043494a401@chromium.org>

ppy/angle,MSOpenTech/angle,MSOpenTech/angle,ppy/angle,ppy/angle,MSOpenTech/angle,ppy/angle,MSOpenTech/angle