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Having information about the format currently set on a queue is
valuable, e.g. to validate queued buffers. Rewrite the output queue
format setting method of V4L2SliceVideoDecoder into an equivalent method
of V4L2Queue, and use it from there.

Bug: 1003223
Test: video_decode_accelerator_tests passing on Kevin.

Change-Id: Iaaf56809a46a0c193bf890c73b4bcfac4988374f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1839319
Commit-Queue: Hirokazu Honda <hiroh@chromium.org>
Reviewed-by: Hirokazu Honda <hiroh@chromium.org>
Auto-Submit: Alexandre Courbot <acourbot@chromium.org>
Cr-Commit-Position: refs/heads/master@{#703198}