Implement ServiceWorker::postMessage() [Blink]

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

+var port;
+self.addEventListener('message', function(e) {
+    var message = e.data;
+    if ('port' in message) {
+        port = message.port;
+        doIndexedDBTest();
+    }
+});
+function send(action, text) {
+    if (port) port.postMessage({action: action, text: text});
+}
+
+function evalAndLog(s) {
+    send('log', s);
+    try {
+        return eval(s);
+    } catch (ex) {
+        send('fail', 'EXCEPTION: ' + ex);
+        throw ex;
+    }
+}
+
+function debug(s) {
+    send('log', s);
+}
+
+function doIndexedDBTest() {
+    debug('Preparing the database in the service worker');
+    var request = evalAndLog("indexedDB.deleteDatabase('db')");
+    request.onsuccess = function() {
+        request = evalAndLog("indexedDB.open('db')");
+        request.onupgradeneeded = function() {
+            db = request.result;
+            evalAndLog("db.createObjectStore('store')");
+        };
+        request.onsuccess = function() {
+            db = request.result;
+            evalAndLog("tx = db.transaction('store', 'readwrite')");
+            evalAndLog("store = tx.objectStore('store')");
+            evalAndLog("store.put('value', 'key')");
+            tx.oncomplete = function() {
+                send('quit');
+            };
+        };
+    };
+}