Add flush to output to try to diagnose locks failure

snapshot/win/end_to_end_test.py

 #!/usr/bin/env python
 
 # Copyright 2015 The Crashpad Authors. All rights reserved.
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.
 # You may obtain a copy of the License at
 #
 #     http://www.apache.org/licenses/LICENSE-2.0
 #
@@ skipping 115 matching lines @@
         '-z', dump_path,
         '-c', command + ';q'
     ])
 
   def Check(self, pattern, message, re_flags=0):
     match_obj = re.search(pattern, self.out, re_flags)
     if match_obj:
       # Matched. Consume up to end of match.
       self.out = self.out[match_obj.end(0):]
       print 'ok - %s' % message
+      sys.stdout.flush()
     else:
       print >>sys.stderr, '-' * 80
       print >>sys.stderr, 'FAILED - %s' % message
       print >>sys.stderr, '-' * 80
       print >>sys.stderr, 'did not match:\n  %s' % pattern
       print >>sys.stderr, '-' * 80
       print >>sys.stderr, 'remaining output was:\n  %s' % self.out
       print >>sys.stderr, '-' * 80
+      sys.stderr.flush()
       sys.exit(1)
 
 
 def RunTests(cdb_path, dump_path, pipe_name):
   """Runs various tests in sequence. Runs a new cdb instance on the dump for
   each block of tests to reduce the chances that output from one command is
   confused for output from another.
   """
   out = CdbRun(cdb_path, dump_path, '.ecxr')
   out.Check('This dump file has an exception of interest stored in it',
@@ skipping 55 matching lines @@
 
     RunTests(cdb_path, dump_path, pipe_name)
 
     return 0
   finally:
     CleanUpTempDirs()
 
 
 if __name__ == '__main__':
   sys.exit(main(sys.argv[1:]))