Fix presubmit check for the case when cpplint fails.

tools/presubmit.py

 #!/usr/bin/env python
 #
 # Copyright 2012 the V8 project authors. All rights reserved.
 # Redistribution and use in source and binary forms, with or without
 # modification, are permitted provided that the following conditions are
 # met:
 #
 #     * Redistributions of source code must retain the above copyright
 #       notice, this list of conditions and the following disclaimer.
 #     * Redistributions in binary form must reproduce the above
@@ skipping 96 matching lines @@
 
 def CppLintWorker(command):
   try:
     process = subprocess.Popen(command, stderr=subprocess.PIPE)
     process.wait()
     out_lines = ""
     error_count = -1
     while True:
       out_line = process.stderr.readline()
       if out_line == '' and process.poll() != None:
+        if error_count == -1:
+          print "Failed to process %s" % command.pop()
+          return 1
         break
       m = LINT_OUTPUT_PATTERN.match(out_line)
       if m:
         out_lines += out_line
         error_count += 1
-    sys.stderr.write(out_lines)
+    sys.stdout.write(out_lines)
     return error_count
   except KeyboardInterrupt:
     process.kill()
   except:
     print('Error running cpplint.py. Please make sure you have depot_tools' +
           ' in your $PATH. Lint check skipped.')
     process.kill()
 
 
 class FileContentsCache(object):
@@ skipping 242 matching lines @@
   print "Running copyright header and trailing whitespaces check..."
   success = SourceProcessor().Run(workspace) and success
   if success:
     return 0
   else:
     return 1
 
 
 if __name__ == '__main__':
   sys.exit(Main())