Don't silently swallow error about symbolize script not existing.

testing/test_env.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.
 
 """Sets environment variables needed to run a chromium unit test."""
 
 import os
 import stat
 import subprocess
@@ skipping 138 matching lines @@
   json_path = get_json_path(cmd)
   if json_path is None:
     return
 
   try:
     symbolize_command = get_sanitizer_symbolize_command(
         json_path=json_path, executable_path=cmd[0])
     p = subprocess.Popen(symbolize_command, stderr=subprocess.PIPE, env=env)
     (_, stderr) = p.communicate()
   except OSError as e:
-      print 'Exception while symbolizing snippets: %s' % e
+    print >> sys.stderr, 'Exception while symbolizing snippets: %s' % e
+    raise
 
   if p.returncode != 0:
-    print "Error: failed to symbolize snippets in JSON:\n"
-    print stderr
+    print >> sys.stderr, "Error: failed to symbolize snippets in JSON:\n"
+    print >> sys.stderr, stderr
+    raise subprocess.CalledProcessError(p.returncode, symbolize_command)
 
 
 def run_executable(cmd, env):
   """Runs an executable with:
     - environment variable CR_SOURCE_ROOT set to the root directory.
     - environment variable LANGUAGE to en_US.UTF-8.
     - environment variable CHROME_DEVEL_SANDBOX set
     - Reuses sys.executable automatically.
   """
   extra_env = {}
@@ skipping 57 matching lines @@
     print >> sys.stderr, 'Failed to start %s' % cmd
     raise
 
 
 def main():
   return run_executable(sys.argv[1:], os.environ.copy())
 
 
 if __name__ == '__main__':
   sys.exit(main())