Webkit: XHR push files

upload.js

function upload(url, uint8Data) {                                                     
    var xhr,
        formData = new FormData(),
        blobBuilder = new WebKitBlobBuilder(),
        blob;
                                                                                         
    blobBuilder.append(uint8Data);

    blob = blobBuilder.getBlob();
        
    formData.append('aFile', blob);

    xhr = new XMLHttpRequest();
    xhr.open('POST', url, true);
    xhr.send(formData);
    // xhr.send(blob);
}