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The queue statements on input buffers were not checked, which could lead
to errors going unnoticed and only being noticed later. Similarly an
error when queueing an output buffer should result in an error message.

BUG=None
TEST=video.DecodeAccel.h264 passes on Trogdor.

Change-Id: Ib96af994c34dadf63c827f0284a8c8a581c016b1
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2440327
Commit-Queue: Alexandre Courbot <acourbot@chromium.org>
Reviewed-by: Fritz Koenig <frkoenig@chromium.org>
Cr-Commit-Position: refs/heads/master@{#813626}