Added guts to pull call signatures when assertions & expectations fail.

chrome/test/data/webui/sample_fail.js

+// 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 testSeveralExpect() {
+  expectTrue(false);
+  expectTrue(false, 'false message');
+  expectTrue(5 < 2);
+  expectTrue(5 < 2, '5 < 2 message');
+  expectEquals(5, 2);
+  expectEquals(5, 2, 'equals message');
+}
+
+function testTwoExpect() {
+  console.info('testTwoExpect');
+  expectTrue(0);
+  expectTrue('');
+}
+
+function testDoubleInvocation() {
+  console.info('testDoubleInvocation');
+  testTwoExpect();
+  testTwoExpect();
+}
+
+var test_fixture = 'WebUIBrowserTestFail';
+var test_assert = 'ASSERT_FALSE';