[opus] Experimental Opus support in Chrome

[Ralph Giles]

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In addition to Chrome's support for Opus in WebRTC, Tom Flanagan has
added support for .opus files in the HTML <audio> element, similar to
what Firefox has. It's currently behind a switch, so you'll need to
pass --enable-opus-playback to M25 or M26 to evaluate.

I tried some the files https://people.xiph.org/~greg/opus_testvectors/
in yesterday's Chrome Canary. It looks like the gain header and
surround channel mapping isn't implemented yet, but basic playback
seems to work fine. This is great news!

https://code.google.com/p/chromium/issues/detail?id=104241#c33

 -r
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