[web-audio-api] Specify what should happen when the input channel count changes for delay nodes (#25)

> Originally reported on W3C Bugzilla [ISSUE-21426](https://www.w3.org/Bugs/Public/show_bug.cgi?id=21426) Thu, 28 Mar 2013 17:05:04 GMT
> Reported by Ehsan Akhgari [:ehsan]
> Assigned to 

For example, when the input channel count increases, it's not clear whether we need to playback silence or an upmixed version of the delayed buffer.  The rather might not be efficient to implement because it might require a large amount of work when processing the first buffer after the input channel count change.

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https://github.com/WebAudio/web-audio-api/issues/25