[NaCl SDK] Add keyboard interrupt handlers for python scripts

native_client_sdk/src/build_tools/test_sdk.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.
 
 
 import optparse
 import os
 import sys
 
@@ skipping 77 matching lines @@
   toolchains = ['newlib', 'glibc', 'pnacl', 'host']
 
   BuildStepBuildExamples(pepperdir, platform)
   BuildStepCopyTests(pepperdir, toolchains, options.experimental, True)
   BuildStepBuildTests(pepperdir, platform)
 
   return 0
 
 
 if __name__ == '__main__':
-  sys.exit(main(sys.argv))
+  try:
+    sys.exit(main(sys.argv))
+  except KeyboardInterrupt:
+    buildbot_common.ErrorExit('test_sdk: interrupted')