Tests getUserMedia called from a background thread.

On success, you will see a series of "PASS" messages, followed by "TEST COMPLETE".


tabState = 'background'
PASS navigator.mediaDevices.getUserMedia({audio:true}).then(gotStream).catch(fail) did not throw exception.
PASS navigator.mediaDevices.getUserMedia({audio:true}).then(gotStream).catch(fail) did not throw exception.
PASS navigator.mediaDevices.getUserMedia({audio:true}).then(gotStream).catch(fail) did not throw exception.
PASS navigator.mediaDevices.getUserMedia({audio:true}).then(gotStream).catch(fail) did not throw exception.

** timer fired **
PASS tabState is 'background'
tabState = 'foreground'

** getUserMedia() promise resolved **
PASS tabState is 'foreground'
PASS stream.getAudioTracks().length is 1

** getUserMedia() promise resolved **
PASS tabState is 'foreground'
PASS stream.getAudioTracks().length is 1

** getUserMedia() promise resolved **
PASS tabState is 'foreground'
PASS stream.getAudioTracks().length is 1

** getUserMedia() promise resolved **
PASS tabState is 'foreground'
PASS stream.getAudioTracks().length is 1
PASS successfullyParsed is true

TEST COMPLETE