[web-audio-api] Allow Shared audio buffers between contexts (#197)

> Originally reported on W3C Bugzilla [ISSUE-21531](https://www.w3.org/Bugs/Public/show_bug.cgi?id=21531) Tue, 02 Apr 2013 15:08:37 GMT
> Reported by Olivier Thereaux
> Assigned to 

Per discussion at Audio WG f2f 2013-03-26

There is a use case for shared audio buffer between audioContexts: a large sample library, for instance, should be sharable and not re-(down)loaded in memory for each context.

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https://github.com/WebAudio/web-audio-api/issues/197