Re-Reland Combined test runner.

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 glob
 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 RunCommandToFile(cmd, file):
+  try:
+    subprocess.check_call(cmd, stdout=file)
+    return None
+  except subprocess.CalledProcessError as e:
+    return e
+
 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
 
+
 # Adjust Dr. Memory wrapper to have separate log directory for each test
 # for better error reporting.
 def DrMemoryWrapper(wrapper, pdf_name):
   if not wrapper:
     return []
   # convert string to list
   cmd_to_run = wrapper.split()
 
   # Do nothing if using default log directory.
   if cmd_to_run.count("-logdir") == 0:
@@ skipping 65 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