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"Broker" acts as a simple decoder, but under the hood manages creation
and selection of of underlying media::AudioDecoders, and thread-hopping.

This also enables WebCodecs to use MojoAudioDecoder (android) when not
in a Worker context. For Workers, we still need to expose the relevant
Mojo interfaces (currently tied to the RenderFrame).

Bug: 1094091
Change-Id: I3743de18aa6701428fc3655a2e917c3b447c4a3f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2333379
Commit-Queue: Chrome Cunningham <chcunningham@chromium.org>
Reviewed-by: Dan Sanders <sandersd@chromium.org>
Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Cr-Commit-Position: refs/heads/master@{#795611}