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This CL causes D3D11VideoDecoder to listen to the video decoder's
config for whether it prefers one Texture2D with multiple array
slices, or multiple Texture2Ds with one array slice eacy to hold
decoded output.  Previously, we would always do the former.

Also, this CL adds a workaround to force multi-texture / one slice
mode for some Intel drivers which require it.

Bug: 971952
Change-Id: I4f12ead43aec2d35f463cc46d9a3bfc61500dc5e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2191157Reviewed-by: Ted Meyer <tmathmeyer@chromium.org>
Reviewed-by: Zhenyao Mo <zmo@chromium.org>
Commit-Queue: Frank Liberato <liberato@chromium.org>
Cr-Commit-Position: refs/heads/master@{#772409}