Run_test_case.py now returns 1 when at least 1 test fails.

tools/isolate/run_test_cases.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 each test cases as a single shard, single process execution.
 
 Similar to sharding_supervisor.py but finer grained. Runs multiple instances in
 parallel.
 """
@@ skipping 536 matching lines @@
     print '%s is flaky (tried %d times)' % (test_case, len(items))
 
   print 'Success: %4d %5.2f%%' % (len(success), len(success) * 100. / total)
   print 'Flaky:   %4d %5.2f%%' % (len(flaky), len(flaky) * 100. / total)
   print 'Fail:    %4d %5.2f%%' % (len(fail), len(fail) * 100. / total)
   print '%.1fs Done running %d tests with %d executions. %.1f test/s' % (
       duration,
       len(results),
       nb_runs,
       nb_runs / duration)
-  return 0
+  return int(bool(fail))
 
 
 def main():
   """CLI frontend to validate arguments."""
   def as_digit(variable, default):
     if variable.isdigit():
       return int(variable)
     return default
 
   parser = optparse.OptionParser(usage='%prog <options> [gtest]')
@@ skipping 84 matching lines @@
   return run_test_cases(
       executable,
       test_cases,
       options.jobs,
       options.timeout,
       options.no_dump)
 
 
 if __name__ == '__main__':
   sys.exit(main())