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When the system gets busy, it's possible for the video capture buffer
pool to run out of buffers temporarily.  Instead of raising an exception
we should handle the case gracefully, dropping a camera frame in the
worst case.

Design doc: go/cros-camera:dd:zero-copy

Bug: 982201
Change-Id: I23d2e45b8427bd36ea663410817e4361252823c3
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1712844Reviewed-by: Shik Chen <shik@chromium.org>
Commit-Queue: Ricky Liang <jcliang@chromium.org>
Cr-Commit-Position: refs/heads/master@{#682158}