D3D11: Add a test to cover a clear RTV driver bug. See dEQP-GLES3.functional.fbo.color.repeated_clear.sample.tex2d.rgba8 This test uses ClearRenderTargetView to clear various FBO textures, but it does not seem to work correctly on my Nvidia configuration. It has been reported to Nvidia. It also seems to fail on Intel. Current GPU: NVIDIA GeForce GTX 660 Current Driver: 10.18.13.5598 (9-13-2015) Works on Desktop OpenGL back-end, also on AMD R5230 BUG=angleproject:1305 Change-Id: I4b53b7376faf71f234d05c90f4fb55462de23e36 Reviewed-on: https://chromium-review.googlesource.com/314304 Reviewed-by: Geoff Lang <geofflang@chromium.org> Reviewed-by: Jamie Madill <jmadill@chromium.org> Commit-Queue: Jamie Madill <jmadill@chromium.org>