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Previously, we checked only the finch flag for swap chain support,
in order to turn off resource sharing.  This was intended to avoid
a bug on intel platforms.

This CL replaces the finch check with a more robust one, to match
what dxva does.

Bug: 998901
Change-Id: I377e8e01169c927dd4431e8f22729d0d9c3fa7e0
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1775264Reviewed-by: Ted Meyer <tmathmeyer@chromium.org>
Commit-Queue: Ted Meyer <tmathmeyer@chromium.org>
Auto-Submit: Frank Liberato <liberato@chromium.org>
Cr-Commit-Position: refs/heads/master@{#693905}