Run Clang plugin tests on the ToT bots

tools/clang/scripts/update.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.
 
 """Windows can't run .sh files, so this is a Python implementation of
 update.sh. This script should replace update.sh on all platforms eventually."""
 
 import argparse
 import os
@@ skipping 277 matching lines @@
   aux_sanitizer_include_dir = os.path.join(LLVM_BUILD_DIR, 'lib', 'clang',
                                            VERSION, 'include_sanitizer',
                                            'sanitizer')
   if not os.path.exists(aux_sanitizer_include_dir):
     os.makedirs(aux_sanitizer_include_dir)
   for _, _, files in os.walk(sanitizer_include_dir):
     for f in files:
       CopyFile(os.path.join(sanitizer_include_dir, f),
                aux_sanitizer_include_dir)
 
-  if args.run_tests:
+  if args.run_tests or use_head_revision:
     os.chdir(LLVM_BUILD_DIR)
     RunCommand(GetVSVersion().SetupScript('x64') +
                ['&&', 'ninja', 'cr-check-all'])
 
   WriteStampFile(LLVM_WIN_REVISION)
   print 'Clang update was successful.'
   return 0
 
 
 def main():
@@ skipping 39 matching lines @@
 
   if re.search(r'\b(make_clang_dir)=', os.environ.get('GYP_DEFINES', '')):
     print 'Skipping Clang update (make_clang_dir= was set in GYP_DEFINES).'
     return 0
 
   return UpdateClang(args)
 
 
 if __name__ == '__main__':
   sys.exit(main())