Getting Chrome timeline from Selenium Log

chrome-selenium-timeline.js

var wd = require('wd');

// This is for Chromedriver directly. 
// If you are using Selenium, use http://localhost:4444/wd/hub
var browser = wd.promiseRemote('http://localhost:9515');
var URL = 'http://islreview.com/'; // Change this to a custom URL

var config = {
    "browserName": "chrome",
    "chromeOptions": {
        "perfLoggingPrefs": {
            "traceCategories": ",blink.console,disabled-by-default-devtools.timeline,benchmark"
        },
        "args": ["--enable-gpu-benchmarking", "--enable-thread-composting"]
    },
    "loggingPrefs": {
        "performance": "ALL"
    }
};

browser.init(config).then(function() {
    console.log('Fetching URL', URL);
    return browser.get(URL);
}).then(function() {
    console.log('Flushing timeline data before we start collecting it for real');
    return browser.log('performance');
}).then(function() {
    console.log('Sending the scroll function to the browser and executing it');
    return browser.execute('(' + scroll.toString() + ')()');
}).then(function() {
    console.log('Wait for scroll to finish. When it finishes, it sets the __scrollComplete__ to true');
    return browser.waitFor({
        asserter: wd.asserters.jsCondition('(window.__scrollComplete__ === true)', false),
        timeout: 1000 * 60 * 10,
        pollFreq: 2000
    });
}).then(function() {
    console.log('Getting actual timeline data - this will take a while');
    return browser.log('performance');
}).then(function(data) {
    console.log('Saving timeline data to a file _perflog.json');
    require('fs').writeFileSync('_perflog.json', JSON.stringify(data.map(function(record) {
        return JSON.parse(record.message).message;
    })), null, 4);
}).fin(function() {
    // Disable the following statement if you want to keep the browser open
    return browser.quit();
}).done();


// This function scrolls the page. Calling this function from the browser dev tools console should also scroll the pgae
var scroll = function() {
    window.chrome.gpuBenchmarking.smoothScrollBy(5000, function() {
        window.__scrollComplete__ = true;
    }, 0, 0, chrome.gpuBenchmarking.DEFAULT_INPUT, 'down', 800);
}

Hi,
Sounds interesting.
The output file doesn't seem to be a HAR type file.
So how do you analyze the results?
Regards,