Yaho

third_party/WebKit/LayoutTests/http/tests/serviceworker/resources/windowclient-navigate-worker.js

+self.onmessage = function(e) {
+  var url = e.data;
+  var host;
+  var client;
+
+  self.clients.matchAll({ includeUncontrolled : true }).then(function(cs) {
+        cs.forEach(function(c) {
+              if (c.url.search('#message') != -1)
+                host = c;
+              else if (c.url.search('#client') != -1)
+                client= c;
+            });
+        client.navigate(url).then(function(c) {
+              if (!c)
+                host.postMessage(c);
+              else
+                host.postMessage(c.url);
+            })
+          .catch(function(e) {
+              console.log(e);
+              console.log(e.name);
+              host.postMessage(e.name);
+            });
+      });
+};