Fix python scripts in src/tools/

tools/dromaeo_benchmark_runner/dromaeo_benchmark_runner.py

Index: tools/dromaeo_benchmark_runner/dromaeo_benchmark_runner.py
diff --git a/tools/dromaeo_benchmark_runner/dromaeo_benchmark_runner.py b/tools/dromaeo_benchmark_runner/dromaeo_benchmark_runner.py
old mode 100644
new mode 100755
index 97c410c38923929831753dcb965d5ab63d1c30ab..15d8446c9d2dfa4656082daea103acb17132faf2
--- a/tools/dromaeo_benchmark_runner/dromaeo_benchmark_runner.py
+++ b/tools/dromaeo_benchmark_runner/dromaeo_benchmark_runner.py
@@ -1,6 +1,7 @@
 #!/usr/bin/env python
-#
-# Copyright 2009 Google Inc. All Rights Reserved.
+# Copyright (c) 2011 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.
 
 """Dromaeo benchmark automation script.
 
@@ -48,6 +49,7 @@ import gdata.spreadsheet.service
 max_spreadsheet_columns = 20
 test_props = ['mean', 'error']
 
+
 def ParseArguments():
   parser = OptionParser()
   parser.add_option("-b", "--browser",
@@ -257,7 +259,8 @@ def main():
       spreadsheet_writer.WriteBrowserBenchmarkResults(test_name, test_data)
 
   server.socket.close()
+  return 0
 
-if __name__ == '__main__':
-  main()
 
+if __name__ == '__main__':
+  sys.exit(main())