In preparation of patches that will allow V4L2 decoding to work by
default on Linux.
The VA-API and V4L2 backends provide essenitaly the same output -
DMABufs in formats like NV12/P010 etc. - and face similar restrictions
e.g. GL driver features. It therefore makes sense to have the same media
switches and in fact some of them - most importantly
`VaapiVideoDecodeLinux` - already apply to V4L2.
Thus in order to reduce confusion and avoid code duplication, rename
some of the `Vaapi` swiches used in common code to `Accelerated` but
keep the `Linux` suffix, making it clearer to what they apply. Also
ensure they are used for both APIs the same way and update the
`vaapi.md`.
Finally, add `AcceleratedVideoDecodeLinuxZeroCopyGL` to the VA-API
documentation.
Bug: b:334110478
Change-Id: Iea58966d6ab94ce995defb1cf1099dd9ba9fae26
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5893615
Reviewed-by: Sean Topping <seantopping@chromium.org>
Reviewed-by: Kentaro Hara <haraken@chromium.org>
Reviewed-by: Fritz Koenig <frkoenig@chromium.org>
Commit-Queue: Fritz Koenig <frkoenig@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1363231}
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