Merge to XFA: Parallelize run_corpus_tests.py.

- Use the number of cores as the default -j value
- Fall back to old code for -j 1

TBR=nparker@chromium.org

Review URL: https://codereview.chromium.org/1398793003 .

(cherry picked from commit fd751f28cecce61ab36038799043639d570e0b26)

Review URL: https://codereview.chromium.org/1395253002 .

1 files changed, 12 insertions, 0 deletions

diff --git a/testing/tools/common.py b/testing/tools/common.py
index 14745a8a3e..d45404b4d4 100755
--- a/testing/tools/common.py
+++ b/testing/tools/common.py
@@ -4,6 +4,7 @@
 # found in the LICENSE file.
 
 import os
+import subprocess
 import sys
 
 def os_name():
@@ -16,6 +17,17 @@ def os_name():
   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.'''