Merge to XFA: Parallelize run_corpus_tests.py.

testing/tools/common.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 os
+import subprocess
 import sys
 
 def os_name():
   if sys.platform.startswith('linux'):
     return 'linux'
   if sys.platform.startswith('win'):
     return 'win'
   if sys.platform.startswith('darwin'):
     return 'mac'
   raise Exception('Confused, can not determine OS, aborting.')
 
 
+def RunCommand(cmd, redirect_output=False):
+  try:
+    if redirect_output:
+      sys.stdout.write(subprocess.check_output(cmd, stderr=subprocess.STDOUT))
+    else:
+      subprocess.check_call(cmd)
+    return None
+  except subprocess.CalledProcessError as e:
+    return e
+
+
 class DirectoryFinder:
   '''A class for finding directories and paths under either a standalone
   checkout or a chromium checkout of PDFium.'''
 
   def __init__(self, build_location):
     # |build_location| is typically "out/Debug" or "out/Release".
     # Expect |my_dir| to be .../pdfium/testing/tools.
     self.my_dir = os.path.dirname(os.path.realpath(__file__))
     self.testing_dir = os.path.dirname(self.my_dir)
     if (os.path.basename(self.my_dir) != 'tools' or
@@ skipping 32 matching lines @@
     if other_components:
       result = os.path.join(result, other_components)
     return result
 
   def TestingDir(self, other_components=''):
     '''Finds test files somewhere under the testing directory.'''
     result = self.testing_dir
     if other_components:
       result = os.path.join(result, other_components)
     return result