Dartifying some IndexedDB APIs.

tests/html/utils.dart

Index: tests/html/utils.dart
diff --git a/tests/html/utils.dart b/tests/html/utils.dart
index 9be11b071bb437b136fc86b4dbbc0c7c69c23577..4a6369af3fbe4ac70ed643dd55288b9c75d6a579 100644
--- a/tests/html/utils.dart
+++ b/tests/html/utils.dart
@@ -1,4 +1,5 @@
 library TestUtils;
+import 'dart:async';
 import '../../pkg/unittest/lib/unittest.dart';
 
 /**
@@ -68,3 +69,22 @@ verifyGraph(expected, actual) {
 
   walk('', expected, actual);
 }
+
+void futureTest(spec, Future body()) {
+  test(spec, () {
+    expect(body(), completes);
+  });
+}
+
+/**
+ * Executes an array of test functions which return futures in parallel.
+ *
+ * This returns a future result of the last function.
+ */
+Future chainSteps(List<Function> steps) {
+  var future = steps[0](null);
+  for (var step in steps.skip(1)) {
+    future = future.then(step);
+  }
+  return future;
+}