Port aria_util_test.js to run as a WebUI test.

tools/gypv8sh.py

 #!/usr/bin/env python
 # Copyright (c) 2012 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.
 
 """This script is used by chrome_tests.gypi's js2webui action to maintain the
 argument lists and to generate inlinable tests.
 
 Usage:
   python tools/gypv8sh.py v8_shell mock.js test_api.js js2webui.js \
@@ skipping 31 matching lines @@
          axs_testing_js, test_api, js2webui])
   if opts.verbose or opts.impotent:
     print cmd
   if not opts.impotent:
     try:
       with open(cxxoutfile, 'w') as f:
         subprocess.check_call(cmd, stdin=subprocess.PIPE, stdout=f)
       shutil.copyfile(inputfile, jsoutfile)
     except Exception, ex:
       if os.path.exists(cxxoutfile):
+        # The contents of the output file will include the error message.
+        print open(cxxoutfile).read()
         os.remove(cxxoutfile)
       if os.path.exists(jsoutfile):
         os.remove(jsoutfile)
       raise
 
 
 if __name__ == '__main__':
  sys.exit(main())