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This CL follows crrev.com/c/2393629 by batching up SubmitBuffer
calls in the VP8 decode accelerator.

This is verified via chrome:tracing and codepen.io/full/qzYXba that
plays 4 1280x572 VP8 videos at the same time. Tracing is captured for
a few seconds, basically the SubmitBuffers() call takes ~0.312ms/call
versus the individual SubmitBuffer() calls ~0.072ms -- which gives
an aggregate of 0.360ms, or savings of about ~20%. Since decoding
itself takes about the same as SubmitBuffers on my BSW device (reks),
batching gives ~10% reduction in decode time.

Bug: b/166646505
Change-Id: I11c5570bea1c049fe0e9af75239bd60ac906a843
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2401512
Commit-Queue: Miguel Casas <mcasas@chromium.org>
Reviewed-by: J Kardatzke <jkardatzke@chromium.org>
Cr-Commit-Position: refs/heads/master@{#805556}