First checked-in import of the W3C's test suites.

LayoutTests/imported/web-platform-tests/IndexedDB/idbworker.js

+var db
+
+self.addEventListener('message', MessageHandler, false)
+
+function MessageHandler(e)
+{
+    var open_rq, idb = self.indexedDB || self.msIndexedDB || self.webkitIndexedDB || self.mozIndexedDB
+
+    if (!idb)
+    {
+        self.postMessage(false)
+        return
+    }
+    else
+        self.postMessage(true)
+
+    open_rq = idb.open("webworker101", 1)
+
+    open_rq.onupgradeneeded = function(e) {
+        db = e.target.result
+        db.createObjectStore("store")
+          .add("test", 1)
+    }
+    open_rq.onsuccess = function(e) {
+        db = e.target.result
+        db.onerror = function() { self.postMessage("db.error") }
+        db.transaction("store").objectStore("store").get(1).onsuccess = function(e) {
+            self.postMessage(e.target.result)
+            db.close()
+        }
+    }
+    open_rq.onerror = function() { self.postMessage("open.error") }
+    open_rq.onblocked = function() { self.postMessage("open.blocked") }
+}