Hook up the dartdoc tests to test.py, test.dart, and frog/presubmit.py.

utils/tests/dartdoc/test_config.dart

Index: utils/tests/dartdoc/test_config.dart
diff --git a/utils/tests/dartdoc/test_config.dart b/utils/tests/dartdoc/test_config.dart
new file mode 100644
index 0000000000000000000000000000000000000000..cfc35cc156057d971bbf76bafabd554a415c012c
--- /dev/null
+++ b/utils/tests/dartdoc/test_config.dart
@@ -0,0 +1,17 @@
+// Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
+// for details. All rights reserved. Use of this source code is governed by a
+// BSD-style license that can be found in the LICENSE file.
+
+#library("dartdoc_test_config");
+
+#import("../../../tools/testing/dart/test_suite.dart");
+
+class DartdocTestSuite extends StandardTestSuite {
+  DartdocTestSuite(Map configuration)
+      : super(configuration,
+              "dartdoc",
+              "utils/tests/dartdoc/src",
+              ["utils/tests/dartdoc/dartdoc.status"]);
+
+  bool isTestFile(String filename) => filename.endsWith("_tests.dart");
+}