Support automatic javascript test registry in gtest when creating WebUI tests.

chrome/test/data/webui/sample_failing.js

Index: chrome/test/data/webui/sample_failing.js
diff --git a/chrome/test/data/webui/sample_failing.js b/chrome/test/data/webui/sample_failing.js
new file mode 100644
index 0000000000000000000000000000000000000000..ae2ab8dec5a27c39495bcffdf44afc87e47714ce
--- /dev/null
+++ b/chrome/test/data/webui/sample_failing.js
@@ -0,0 +1,9 @@
+// Copyright (c) 2011 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+// Sample tests that exercise the test JS library and show how this framework
+// could be used to test the downloads page.
+function testConsoleError() {
+  console.error('checking console.error call causes failure.');
+}