Hook up show-config to testing scripts.

testing/tools/run_javascript_tests.py

 #!/usr/bin/env python
 # Copyright 2015 The PDFium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 import optparse
 import os
 import re
 import subprocess
 import sys
@@ skipping 45 matching lines @@
   source_dir = finder.TestingDir(os.path.join('resources', 'javascript'))
   pdfium_test_path = finder.ExecutablePath('pdfium_test')
   if not os.path.exists(pdfium_test_path):
     print "FAILURE: Can't find test executable '%s'" % pdfium_test_path
     print "Use --build-dir to specify its location."
     return 1
   working_dir = finder.WorkingDir(os.path.join('testing', 'javascript'))
   if not os.path.exists(working_dir):
     os.makedirs(working_dir)
 
+  feature_string = subprocess.check_output([pdfium_test_path, '--show-config'])
+  if "V8" not in feature_string.strip().split(","):
+    print "V8 not enabled, skipping."
+    return 0
+
   input_files = []
   if len(args):
     for file_name in args:
       input_files.append(file_name.replace(".pdf", ".in"))
   else:
     input_files = os.listdir(source_dir)
 
   failures = []
   input_file_re = re.compile('^[a-zA-Z0-9_.]+[.]in$')
   for input_filename in input_files:
     if input_file_re.match(input_filename):
       input_path = os.path.join(source_dir, input_filename)
       if os.path.isfile(input_path):
         if not generate_and_test(input_filename, source_dir, working_dir,
                                  fixup_path, pdfium_test_path, text_diff_path,
                                  options.wrapper):
           failures.append(input_path)
 
   if failures:
     failures.sort()
     print '\n\nSummary of Failures:'
     for failure in failures:
       print failure
     return 1
   return 0
 
 
 if __name__ == '__main__':
   sys.exit(main())