Replace load times

content.js

@@ -1,13 +1,39 @@
-var loadTimes = window.chrome.loadTimes();
-// send spdy info for current page
-chrome.runtime.sendMessage({
-  spdy: loadTimes.wasFetchedViaSpdy,
-  info: loadTimes.npnNegotiatedProtocol || loadTimes.connectionInfo
-});
+var loadTimes = null;
+function getLoadTimes() {
+  return loadTimes || (loadTimes = window.chrome.loadTimes());
+}
 
-chrome.runtime.onMessage.addListener(function (res, sender, sendResponse) {
+function wasFetchedViaSpdy() {
+  // SPDY is deprecated in favor of HTTP/2, but this implementation returns
+  // true for HTTP/2 or HTTP2+QUIC/39 as well.
+  if (window.PerformanceNavigationTiming) {
+    const ntEntry = performance.getEntriesByType('navigation')[0];
+    return ['h2', 'hq'].includes(ntEntry.nextHopProtocol);
+  }
+  return getLoadTimes().wasFetchedViaSpdy;
+}
+
+function connectionInfo() {
+  if (window.PerformanceNavigationTiming) {
+    // NPN is deprecated in favor of ALPN, but this implementation returns true
+    // for HTTP/2 or HTTP2+QUIC/39 requests negotiated via ALPN.
+    const ntEntry = performance.getEntriesByType('navigation')[0]
+    return ['h2', 'hq'].includes(ntEntry.nextHopProtocol) || ntEntry.nextHopProtocol
+  }
+  var loadTimes = getLoadTimes();
+  return loadTimes.wasNegotiatedProtocol || loadTimes.connectionInfo;
+}
+
+function sendInfo() {
   chrome.runtime.sendMessage({
-    spdy: loadTimes.wasFetchedViaSpdy,
-    info: loadTimes.npnNegotiatedProtocol || loadTimes.connectionInfo
+    spdy: wasFetchedViaSpdy(),
+    info: connectionInfo()
   });
+}
+
+// send spdy info for current page
+sendInfo();
+
+chrome.runtime.onMessage.addListener(function (res, sender, sendResponse) {
+  sendInfo();
 });