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

chrome/chrome_tests.gypi

 # 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.
 
 {
   'variables' : {
     'pyautolib_sources': [
       'app/chrome_command_ids.h',
       'app/chrome_dll_resource.h',
       'common/automation_constants.h',
@@ skipping 2552 matching lines @@
         'renderer/print_web_view_helper_browsertest.cc',
         'renderer/safe_browsing/malware_dom_details_browsertest.cc',
         'renderer/safe_browsing/phishing_classifier_browsertest.cc',
         'renderer/safe_browsing/phishing_classifier_delegate_browsertest.cc',
         'renderer/safe_browsing/phishing_dom_feature_extractor_browsertest.cc',
         'renderer/safe_browsing/phishing_thumbnailer_browsertest.cc',
         'renderer/safe_browsing/render_view_fake_resources_test.cc',
         'renderer/safe_browsing/render_view_fake_resources_test.h',
         'renderer/translate_helper_browsertest.cc',
         'test/automation/dom_automation_browsertest.cc',
+        'test/data/webui/assertions.js',
         'test/data/webui/print_preview.js',
         'test/data/webui/options.js',
         'test/gpu/gpu_browsertest.cc',
         'test/in_process_browser_test_browsertest.cc',
         'test/out_of_proc_test_runner.cc',
         'test/render_view_test.cc',
         'test/render_view_test.h',
         # TODO(craig): Rename this and run from base_unittests when the test
         # is safe to run there. See http://crbug.com/78722 for details.
         '../base/files/file_path_watcher_browsertest.cc',
@@ skipping 1590 matching lines @@
               # Use outputs of this action as inputs for the main target build.
               # Seems as a misnomer but makes this happy on Linux (scons).
               'process_outputs_as_sources': 1,
             },
           ],  # 'actions'
         },
       ]
     }],  # 'coverage!=0'
   ],  # 'conditions'
 }