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When allocating buffers for the output (capture) queue with the new VD,
we should add extra buffers to what the driver says we need to account
for delays with the rest of Chrome's rendering pipeline.

BUG=b:165647432,b:157703889
TEST=Playback no longer stutters on trogdor

Change-Id: I782377dd10e3ac0c63ce12d12b6ac3c49c370b8a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2433591
Commit-Queue: Jeffrey Kardatzke <jkardatzke@google.com>
Auto-Submit: Jeffrey Kardatzke <jkardatzke@google.com>
Reviewed-by: Miguel Casas <mcasas@chromium.org>
Reviewed-by: Alexandre Courbot <acourbot@chromium.org>
Cr-Commit-Position: refs/heads/master@{#811508}