background.js

'use strict';

function startApplication() {
    var timestampId = Date.now(); 
    chrome.app.window.create('index.html', 
    {
        id: "main" + timestampId,
        frame: 'chrome',
        innerBounds : {
            'width' : 1340,
            'height' : 920
        }
    }, 
    function (createdWindow) {
        if (getChromeVersion() >= 54) {
            createdWindow.icon = 'images/bf_icon_128.png';
        }
        try {
            var gui = require('nw.gui');
            createdWindow.contentWindow.argv = gui.App.argv;
        } catch (e) {
            // Require not supported, inside chrome
        }
    });
}

function getChromeVersion () {     
    var raw = navigator.userAgent.match(/Chrom(e|ium)\/([0-9]+)\./);

    return raw ? parseInt(raw[2], 10) : false;
}

chrome.app.runtime.onLaunched.addListener(startApplication);