Replace linux-specific code in test scripts.

testing/tools/run_corpus_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 shutil
 import sys
 
 # Nomenclature:
 #   x_root - "x"
 #   x_filename - "x.ext"
 #   x_path - "path/to/a/b/c/x.ext"
 #   c_dir - "path/to/a/b/c"
 
 def extract_suppressions(filename):
   with open(filename) as f:
     suppressions = [y for y in [
       x.split('#')[0].strip() for x in f.readlines()] if y]
   return suppressions
 
 def test_one_file(input_filename, source_dir, working_dir,
                   pdfium_test_path, pdfium_diff_path):
   input_root, _ = os.path.splitext(input_filename)
   input_path = os.path.join(source_dir, input_filename)
   pdf_path = os.path.join(working_dir, input_filename)
   actual_path_template = os.path.join(working_dir, input_root + '.pdf.%d.png')
   expected_path_template = os.path.join(source_dir,
                                         input_root + '_expected.pdf.%d.png')
   try:
+    shutil.copyfile(input_path, pdf_path)
     sys.stdout.flush()
-    subprocess.check_call(['cp', input_path, pdf_path])
     subprocess.check_call([pdfium_test_path, '--png', pdf_path])
     i = 0;
     while True:
       expected_path = expected_path_template % i;
       actual_path = actual_path_template % i;
       if not os.path.exists(expected_path):
         if i == 0:
           print "WARNING: no expected results files found for " + input_filename
         break
       print "Checking " + actual_path
@@ skipping 89 matching lines @@
     print '\n\nSummary of Failures:'
     for failure in failures:
       print failure
     return 1
 
   return 0
 
 
 if __name__ == '__main__':
   sys.exit(main())