Update from chromium https://crrev.com/302282

testing/scripts/common.py

Index: testing/scripts/common.py
diff --git a/testing/scripts/common.py b/testing/scripts/common.py
index 47e7fb7fd1a223c103c33e6f53bea9003e58db5a..1afbe6b96fe4d7c0ec4d78bd476d0d5a661241e8 100644
--- a/testing/scripts/common.py
+++ b/testing/scripts/common.py
@@ -7,6 +7,7 @@ import contextlib
 import json
 import os
 import subprocess
+import sys
 import tempfile
 
 
@@ -55,6 +56,21 @@ def run_command(argv):
   return rc
 
 
+def run_runtest(cmd_args, runtest_args):
+  return run_command([
+      sys.executable,
+      os.path.join(cmd_args.paths['build'], 'scripts', 'tools', 'runit.py'),
+      '--show-path',
+      sys.executable,
+      os.path.join(cmd_args.paths['build'], 'scripts', 'slave', 'runtest.py'),
+      '--target', cmd_args.build_config_fs,
+      '--xvfb',
+      '--builder-name', cmd_args.properties['buildername'],
+      '--slave-name', cmd_args.properties['slavename'],
+      '--build-number', str(cmd_args.properties['buildnumber']),
+  ] + runtest_args)
+
+
 @contextlib.contextmanager
 def temporary_file():
   fd, path = tempfile.mkstemp()