function checkRecordingState(callback)
    {
        chrome.runtime.sendMessage({
            request: "videoRecordingStatus"
        }, callback);
    }
// Check recording state of background page, callback param is video stream
Check recording state of background page, callback param is video stream
Check recording state of background page callback param is video stream
function checkRecordingState(callback)
    {
        chrome.runtime.sendMessage({
            request: "videoRecordingStatus"
        }, callback);
    }
function checkRecordingState ( callback ) { chrome . runtime . sendMessage ( { request : "videoRecordingStatus" } , callback ) ; }
Check recording state of background page, callback param is video stream
Check recording state of background page callback param is video stream