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There are two V4L2 decode APIs: stateless and stateful. In the VDA era
these were implemented as two completely separate classes
(V4L2VideoDecodeAccelerator and V4L2SliceVideoDecodeAccelerator), which
resulted in a lot of duplicated code and bugs due to fixes not being
replicated on both classes.

For the VD-based decoder, we want to avoid doing the same error and
use a single V4L2 decoder, supported by different backends depending on
which V4L2 API we are using.

This CL is the first step towards that direction: it splits the
V4L2SliceVideoDecoder into its general V4L2 part and the one that is
specific to the stateless API.

Bug: 1003223
Test: video_decode_accelerator_tests passing on Kevin.

Change-Id: I373f3ea739b6799ecad009d053ca7e415b8484bd
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1840034
Commit-Queue: Alexandre Courbot <acourbot@chromium.org>
Reviewed-by: Hirokazu Honda <hiroh@chromium.org>
Reviewed-by: David Staessens <dstaessens@chromium.org>
Reviewed-by: Chih-Yu Huang <akahuang@chromium.org>
Cr-Commit-Position: refs/heads/master@{#705894}