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This CL causes dxva video decoder to send the output metadata for the
display, even if the stream doesn't provide metadata of its own.

For AMD cards, this CL also causes it to send empty stream metadata,
rather than omit sending it.  Otherwise, it crashes intermittently.

Bug: 1045586
Change-Id: If0a478bade4453c235f9f6d77c453e6ea3c179e2
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2020744Reviewed-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@{#737452}