[web-audio-api] OfflineAudioContext should be event target (#199)

> Originally reported on W3C Bugzilla [ISSUE-21529](https://www.w3.org/Bugs/Public/show_bug.cgi?id=21529) Tue, 02 Apr 2013 15:04:30 GMT
> Reported by Olivier Thereaux
> Assigned to 

Per discussion at Audio WG f2f 2013-03-26

OfflineAudioContext should be event target - define event type to pass rendered audio

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Reply to this email directly or view it on GitHub:
https://github.com/WebAudio/web-audio-api/issues/199