//https://developer.chrome.com/extensions/desktopCapture
//https://developers.google.com/web/updates/2015/10/media-devices
//https://developer.mozilla.org/en-US/docs/Web/API/MediaStream_Recording_API
//https://webrtc.github.io/samples/src/content/devices/input-output/S
//https://developer.mozilla.org/zh-CN/docs/Web/API/MediaDevices/getUserMedia
