RUN(internals.initializeMockMediaSource())
RUN(mock = internals.registerMockCDM())
RUN(mock.supportedDataTypes = ["mock"])
RUN(capabilities.initDataTypes = ["mock"])
RUN(capabilities.videoCapabilities = [{ contentType: 'video/mock; codecs="mock"' }] )

Call navigator.requestMediaKeySystemAccess() in a background tab
RUN(promise = navigator.requestMediaKeySystemAccess("org.webkit.mock", [capabilities]))

Switch the tab to foreground
Promise resolved OK
END OF TEST