DNS and Connect timings (resolves #477)

modules/windowPerformance/windowPerformance.js

@@ -15,6 +15,12 @@ module.exports = function(phantomas) {
 	phantomas.setMetric('domContentLoadedEnd'); // @desc time it took to finish handling of onDOMReady event @unreliable
 	phantomas.setMetric('domComplete'); // @desc time it took to load all page resources, the loading spinner has stopped spinning
 
+	// get values from Resource Timing API (issue #477)
+	phantomas.setMetric('performanceTimingConnect'); // @desc time it took to connect to the server before making the first HTTP request
+	phantomas.setMetric('performanceTimingDNS'); // @desc time it took to resolve the domain before making the first HTTP request
+	phantomas.setMetric('performanceTimingPageLoad'); // @desc time it took to fully load the page
+	phantomas.setMetric('performanceTimingTTFB'); // @desc time it took to receive the first byte of the first HTTP response
+
 	// backend vs frontend time
 	phantomas.setMetric('timeBackend'); // @desc time to the first byte compared to the total loading time [%]
 	phantomas.setMetric('timeFrontend'); // @desc time to window.load compared to the total loading time [%]
@@ -41,6 +47,12 @@ module.exports = function(phantomas) {
 		phantomas.setMetric('domContentLoadedEnd', timing.domContentLoadedEventEnd - base);
 		phantomas.setMetric('domComplete', timing.domComplete - base);
 
+		// see #477
+		phantomas.setMetric('performanceTimingConnect', timing.connectEnd - timing.connectStart);
+		phantomas.setMetric('performanceTimingDNS', timing.domainLookupEnd - timing.domainLookupStart);
+		phantomas.setMetric('performanceTimingPageLoad', timing.loadEventStart - timing.navigationStart);
+		phantomas.setMetric('performanceTimingTTFB', timing.responseStart - timing.navigationStart);
+
 		/**
 		 * Emit metrics with backend vs frontend time
 		 *

test/integration-spec.yaml

@@ -333,6 +333,9 @@
     domainsToDomContentLoaded: 2
     requestsToDomComplete: 3
     domainsToDomComplete: 2
+    # test are made using a HTTP server running locally, it should be pretty fast to connect to it
+    performanceTimingConnect: 0
+    performanceTimingDNS: 0
   offenders:
     domainsToDomContentLoaded:
       - { domain: '127.0.0.1', requests: 2 }