SimpleDriveUpload.js

var reader = new FileReader();

reader.readAsBinaryString(fileData);

reader.onload = function (e)
{
    var contentType = fileData.type || MimeTypes.Unknown;

    var runUpload = function (folderID)
    {
        var metadata =
        {
            'title': fileData.name,
            'mimeType': contentType,
            'parents': [ { 'id': defaultParent } ]
        };

        var base64Data = btoa(reader.result);
        var body =  delimiter +
                    'Content-Type: application/json\r\n\r\n' +
                    JSON.stringify(metadata) +
                    delimiter +
                    'Content-Type: ' + contentType + '\r\n' +
                    'Content-Transfer-Encoding: base64\r\n' +
                    '\r\n' +
                    base64Data +
                    close_delim;

        var request = gapi.client.request(
        {
            'path': '/upload/drive/v2/files',
            'method': 'POST',
            'params': { 'uploadType': 'multipart' },
            'headers': {
                'Content-Type': 'multipart/mixed; boundary="' + boundary + '"'
            },
            'body': body
        });

        var callback = function (file)
        {
            
        };

        request.execute(callback);
    }.bind(this);

    runUpload();
}.bind(this);