ServiceWorker: Implement 'source' and 'origin' attributes of ExtendableMessageEvent

third_party/WebKit/LayoutTests/http/tests/serviceworker/ServiceWorkerGlobalScope/resources/extendable-message-event-loopback-worker.js

Index: third_party/WebKit/LayoutTests/http/tests/serviceworker/ServiceWorkerGlobalScope/resources/extendable-message-event-loopback-worker.js
diff --git a/third_party/WebKit/LayoutTests/http/tests/serviceworker/ServiceWorkerGlobalScope/resources/extendable-message-event-loopback-worker.js b/third_party/WebKit/LayoutTests/http/tests/serviceworker/ServiceWorkerGlobalScope/resources/extendable-message-event-loopback-worker.js
new file mode 100644
index 0000000000000000000000000000000000000000..a8885163a817f25404ee525e9cc20c1af665936f
--- /dev/null
+++ b/third_party/WebKit/LayoutTests/http/tests/serviceworker/ServiceWorkerGlobalScope/resources/extendable-message-event-loopback-worker.js
@@ -0,0 +1,44 @@
+self.addEventListener('message', function(event) {
+    switch (event.data.type) {
+      case 'start':
+        self.registration.active.postMessage(
+            {type: '1st', client_id: event.source.id});
+        break;
+      case '1st':
+        // 1st loopback message via ServiceWorkerRegistration.active.
+        var results = [
+            '1st loopback: ' + event,
+            '  event.origin: ' + event.origin,
+            '  event.lastEventId: ' + event.lastEventId,
+            '  event.source: ' + event.source,
+            '  event.source.scriptURL: ' + event.source.scriptURL,
+            '  event.source.state: ' + event.source.state,
+            '  event.ports: ' + event.ports,
+        ];
+        var client_id = event.data.client_id;
+        event.source.postMessage({type: '2nd', client_id: client_id});
+        event.waitUntil(clients.get(client_id)
+            .then(function(client) {
+                client.postMessage({type: 'record', results: results});
+              }));
+        break;
+      case '2nd':
+        // 2nd loopback message via ExtendableMessageEvent.source.
+        var results = [
+            '2nd loopback: ' + event,
+            '  event.origin: ' + event.origin,
+            '  event.lastEventId: ' + event.lastEventId,
+            '  event.source: ' + event.source,
+            '  event.source.scriptURL: ' + event.source.scriptURL,
+            '  event.source.state: ' + event.source.state,
+            '  event.ports: ' + event.ports,
+        ];
+        var client_id = event.data.client_id;
+        event.waitUntil(clients.get(client_id)
+            .then(function(client) {
+                client.postMessage({type: 'record', results: results});
+                client.postMessage({type: 'finish'});
+              }));
+        break;
+      }
+  });