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This implements AV1 hardware decoding according to the DXVA2 spec:
https://www.microsoft.com/en-us/download/details.aspx?id=101577

Bug: 1115846
Test: Manual check of many streams. Passes all AV1 CQ tests.

Change-Id: Ic920484af92fa56fd0422f8d989692be7118cfb4
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2495791
Commit-Queue: Dale Curtis <dalecurtis@chromium.org>
Reviewed-by: Frank Liberato <liberato@chromium.org>
Reviewed-by: James Zern <jzern@google.com>
Cr-Commit-Position: refs/heads/master@{#835535}