[media] Use VDA Capabilities in MojoVideoDecoder.

Basically a quick hack to reduce latency when hardware decode is not
supported, while a more permanent solution is developed. (c.f.
https://chromium-review.googlesource.com/c/chromium/src/+/1066620)

Bug: 839951, 522298
Change-Id: Ib2b51454942e02f144b99605be7915827fc18154
Reviewed-on: https://chromium-review.googlesource.com/1066697
Commit-Queue: Dan Sanders <sandersd@chromium.org>
Reviewed-by: Frank Liberato <liberato@chromium.org>
Cr-Commit-Position: refs/heads/master@{#560348}
1 file changed