[ServiceWorker] Add wpt tests to verify Client.type as 'worker'

third_party/WebKit/LayoutTests/external/wpt/service-workers/service-worker/resources/clients-get-client-types-frame.html

Index: third_party/WebKit/LayoutTests/external/wpt/service-workers/service-worker/resources/clients-get-client-types-frame.html
diff --git a/third_party/WebKit/LayoutTests/external/wpt/service-workers/service-worker/resources/clients-get-client-types-frame.html b/third_party/WebKit/LayoutTests/external/wpt/service-workers/service-worker/resources/clients-get-client-types-frame.html
index 7c949110082e40b60d9e0ee8e352e9f1f0738d5d..4324e6d4054f9a133e683b8851e8b79b7d6b3e1c 100644
--- a/third_party/WebKit/LayoutTests/external/wpt/service-workers/service-worker/resources/clients-get-client-types-frame.html
+++ b/third_party/WebKit/LayoutTests/external/wpt/service-workers/service-worker/resources/clients-get-client-types-frame.html
@@ -7,4 +7,11 @@ fetch('clientId')
   .then(function(text) {
       parent.postMessage({clientId: text}, '*');
     });
+
+onmessage = function(e) {
+  if (e.data == 'StartWorker') {
+    var w = new Worker('clients-get-client-types-frame-worker.js');
+    w.postMessage({cmd:'GetClientId', port:e.ports[0]}, [e.ports[0]]);
+  }
+}
 </script>