[chromedriver] Fix run_all_tests to return correct exit code.

chrome/test/chromedriver/run_all_tests.py

 #!/usr/bin/env python
 # Copyright (c) 2012 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 """Runs all ChromeDriver end to end tests."""
 
 import os
 import shutil
 import sys
@@ skipping 27 matching lines @@
   print '@@@BUILD_STEP chromedriver2_python_tests@@@'
   cmd = [
     sys.executable,
     os.path.join(_THIS_DIR, 'run_py_tests.py'),
     '--chromedriver=' + chromedriver,
     '--chrome=' + chrome,
   ]
   if util.IsMac():
     # In Mac, chromedriver2.so is a 32-bit build, so run with the 32-bit python.
     os.environ['VERSIONER_PYTHON_PREFER_32_BIT'] = 'yes'
-  if util.RunCommand(cmd):
+  code = util.RunCommand(cmd)
+  if code:
     print '@@@STEP_FAILURE@@@'
+  return code
 
 
 def RunJavaTests(chromedriver, chrome):
   print '@@@BUILD_STEP chromedriver2_java_tests@@@'
   cmd = [
     sys.executable,
     os.path.join(_THIS_DIR, 'run_java_tests.py'),
     '--chromedriver=' + chromedriver,
     '--chrome=' + chrome,
   ]
-  if util.RunCommand(cmd):
+  code = util.RunCommand(cmd)
+  if code:
     print '@@@STEP_FAILURE@@@'
+  return code
 
 
 def RunCppTests(cpp_tests):
   print '@@@BUILD_STEP chromedriver2_tests@@@'
-  if util.RunCommand([cpp_tests]):
+  code = util.RunCommand([cpp_tests])
+  if code:
     print '@@@STEP_FAILURE@@@'
+  return code
 
 
 def main():
   chromedriver_map = {
     'win': 'chromedriver2.dll',
     'mac': 'chromedriver2.so',
     'linux': 'libchromedriver2.so',
   }
   chromedriver_name = chromedriver_map[util.GetPlatformName()]
 
@@ skipping 26 matching lines @@
     _AddToolsToSystemPathForWindows()
 
   code1 = RunPythonTests(chromedriver, chrome)
   code2 = RunJavaTests(chromedriver, chrome)
   code3 = RunCppTests(cpp_tests)
   return code1 or code2 or code3
 
 
 if __name__ == '__main__':
   sys.exit(main())