Dartifying some IndexedDB APIs.

tools/dom/templates/html/impl/impl_IDBFactory.darttemplate

Index: tools/dom/templates/html/impl/impl_IDBFactory.darttemplate
diff --git a/tools/dom/templates/html/impl/impl_IDBFactory.darttemplate b/tools/dom/templates/html/impl/impl_IDBFactory.darttemplate
index ec18dba4bd4bf522d8859300da861da6fcaebb82..595a2f6c4d0cf78b66c3d9d09a8b8d01b9fed2e6 100644
--- a/tools/dom/templates/html/impl/impl_IDBFactory.darttemplate
+++ b/tools/dom/templates/html/impl/impl_IDBFactory.darttemplate
@@ -19,5 +19,55 @@ $else
 $endif
   }
 
+  @DomName('IDBFactory.open')
+  Future<Database> open(String name,
+      {int version, void onUpgradeNeeded(VersionChangeEvent)}) {
+    try {
+      var request;
+      if (version != null) {
+        request = $dom_open(name, version);
+      } else {
+        request = $dom_open(name);
+      }
+
+      if (onUpgradeNeeded != null) {
+        request.onUpgradeNeeded.listen(onUpgradeNeeded);
+      }
+      return _completeRequest(request, new Completer<Database>());
+    } catch (e) {
+      return new Future.immediateError(e);
+    }
+  }
+
+  @DomName('IDBFactory.open')
+  Future<IdbFactory> deleteDatabase(String name,
+      {void onBlocked(Event)}) {
+    try {
+      var request = $dom_deleteDatabase(name);
+
+      if (onBlocked != null) {
+        request.onBlocked.listen(onBlocked);
+      }
+      _completeRequest(request, new Completer<Database>());
+    } catch (e) {
+      return new Future.immediateError(e);
+    }
+  }
+
 $!MEMBERS
 }
+
+
+/**
+ * Ties a request to a completer, so the completer is completed when it succeeds
+ * and errors out when the request errors.
+ */
+Future _completeRequest(Request request, Completer completer) {
+  request.onSuccess.listen((e) {
+    completer.complete(request.result);
+  });
+  request.onError.listen((e) {
+    completer.completeError(e);
+  });
+  return completer.future;
+}