Convert Service Worker layout tests to W3C testharness-style tests

LayoutTests/http/tests/serviceworker/resources/indexeddb-worker.js

Index: LayoutTests/http/tests/serviceworker/resources/indexeddb-worker.js
diff --git a/LayoutTests/http/tests/serviceworker/resources/indexeddb-worker.js b/LayoutTests/http/tests/serviceworker/resources/indexeddb-worker.js
new file mode 100644
index 0000000000000000000000000000000000000000..37c22b1ffaf6f06b8e060aad5b06ca885ee551ed
--- /dev/null
+++ b/LayoutTests/http/tests/serviceworker/resources/indexeddb-worker.js
@@ -0,0 +1,26 @@
+var port;
+self.addEventListener('message', function(e) {
+    var message = e.data;
+    if ('port' in message)
+        doIndexedDBTest(message.port);
+});
+
+function doIndexedDBTest(port) {
+    var delete_request = indexedDB.deleteDatabase('db');
+    delete_request.onsuccess = function() {
+        var open_request = indexedDB.open('db');
+        open_request.onupgradeneeded = function() {
+            var db = open_request.result;
+            db.createObjectStore('store');
+        };
+        open_request.onsuccess = function() {
+            var db = open_request.result;
+            var tx = db.transaction('store', 'readwrite');
+            var store = tx.objectStore('store');
+            store.put('value', 'key');
+            tx.oncomplete = function() {
+                port.postMessage('done');
+            };
+        };
+    };
+}