Summary: This new attribute allows authors to modulate the
`.playbackRate` property of the AudioBufferSourceNode in cents (which is
a scale that is more useful in a musical context, because logarithmic
instead of linear). This also aligns the AudioBufferSourceNodes with
other source nodes, that previously had a `.detune` parameter.

Bug: https://bugzilla.mozilla.org/show_bug.cgi?id=1153783

Link to standard:
http://webaudio.github.io/web-audio-api/#widl-AudioBufferSourceNode-detune

Platform coverage: all

Will ship in: 40

Preference behind which this will be implemented: none

DevTools bug: https://bugzilla.mozilla.org/show_bug.cgi?id=1116852

Other browser support: Blink bug
https://code.google.com/p/chromium/issues/detail?id=463279

Tests: dom/media/webaudio/test/test_audioBufferSourceNodeRate.html

Thanks,
Paul.
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