IDCompositionSurfaces can't be bound as SRVs, so don't try to create
SRVs for them.

Also, OMSetRenderTargets must have NumViews <= 1 if an
IDCompositionSurface is being bound. MRT doesn't work with them, and just
having the remaining elements be null isn't enough.

BUG=678800

Change-Id: I76b28de7cbda772bff286eae2b83b70c9dcd2232
Reviewed-on: https://chromium-review.googlesource.com/431134Reviewed-by: Geoff Lang <geofflang@chromium.org>
Commit-Queue: John Bauman <jbauman@chromium.org>