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Add a new VP8 accelerator that supports the upstream UAPI for VP8.

This is just a port of the legacy VP8 accelerator to use the upstream
headers and request API. It has not been thoroughly tested yet.

Bug: 965375
Test: None yet.

Change-Id: Ib06b2cc39a32beefa7314ae03d9ea15f8abc90f6
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1761883
Commit-Queue: Alexandre Courbot <acourbot@chromium.org>
Auto-Submit: Alexandre Courbot <acourbot@chromium.org>
Reviewed-by: Hirokazu Honda <hiroh@chromium.org>
Cr-Commit-Position: refs/heads/master@{#693059}