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The flags are queried through ID3D11Device::CheckFormatSupport().

Hopefully they can be used to bypass YUY2 related tests on AMD
where creating a YUY2 swap chain fails.

Also, they can be useful diagnosing swap chain related issues
from user machines, i.e., whether we assumed certain capabilities
without checking.

BUG=967860
TEST=bots
R=sunnyps@chromium.org,piman@chromium.org

Change-Id: I5dff9069b2fc53851cbffc5263bd4a2e0e03582f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1637195Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Reviewed-by: Antoine Labour <piman@chromium.org>
Reviewed-by: Sunny Sachanandani <sunnyps@chromium.org>
Commit-Queue: Zhenyao Mo <zmo@chromium.org>
Cr-Commit-Position: refs/heads/master@{#665218}