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For Chromecast we want to choose which media renderer to use based on
the types of input content streams. We will use CMA media renderer for
media types that are supported by our hardware (H264, AAC, etc) and
will use the default media renderer for audio streams other than AAC
or Vorbis. This will allow us support software decoding of FLAC and
Opus via the default Chrome audio path.

BUG=457959

Review URL: https://codereview.chromium.org/973633002

Cr-Commit-Position: refs/heads/master@{#318941}