Add offscreen user media recording sample#1717
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records microphone audio in an offscreen document. getUserMedia there cannot show a permission prompt, so a regular extension page opened in a tab grants mic access to the extension origin first. the popup drives start/stop and offers the finished recording for playback and download.
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Adds cookbook.offscreen-user-media: records microphone audio in an offscreen document. getUserMedia in an offscreen document cannot show a permission prompt, so a regular extension page opened in a tab grants mic access to the extension origin first; the popup then drives recording and offers the result for playback and download. Fixes #821. Thanks to @aakash232, whose #1056 worked out the permission approach this builds on.