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MediaCodecAudioDecoder is an audio decoder that uses Android
MediaCodec API and implements the AudioDecoder interface, i.e.
it can be attached to the DecoderStream and used in the Spitzer
pipeline directly.

This CL only defines its interface and have notes about
possible implementation.

BUG=542910

Review URL: https://codereview.chromium.org/1685483002

Cr-Commit-Position: refs/heads/master@{#374734}