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This CL adds two additional feature flags for controlling decoder
selection: `DisableNonPlatformVideoDecoders` and
`DisableNonPlatformAudioDecoders`. These change the predicate
DecoderSelector uses to skip any non-platform decoders, regardless of
config resolution. This is primarily useful for testing platform
decoders without worrying about fallback.

Bug: 1119939
Change-Id: I25191207f65b0da0fc0220133ebf6f383c9dc5d4
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2388272
Commit-Queue: Will Cassella <cassew@google.com>
Reviewed-by: Frank Liberato <liberato@chromium.org>
Cr-Commit-Position: refs/heads/master@{#806393}