Add tools/mac/show_mod_init_func.py to symbolize static initializers without a dSYM.

tools/mac/dump-static-initializers.py

 #!/usr/bin/env python
 # Copyright (c) 2013 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.
 
 """
 Dumps a list of files with static initializers. Use with release builds.
 
 Usage:
-  tools/mac/dump-static-initializers.py out/Release/Chromium\ Framework.framework.dSYM/Contents/Resources/DWARF/Chromium\ Framework 
+  tools/mac/dump-static-initializers.py out/Release/Chromium\ Framework.framework.dSYM/Contents/Resources/DWARF/Chromium\ Framework
 
 Do NOT use mac_strip_release=0 or component=shared_library if you want to use
 this script.
+
+This is meant to be used on a dSYM file. If only an unstripped executable is
+present, use show_mod_init_func.py.
 """
 
 import optparse
 import re
 import subprocess
 import sys
 
 # Matches for example:
 # [     1] 000001ca 64 (N_SO         ) 00     0000   0000000000000000 'test.cc'
 dsymutil_file_re = re.compile("N_SO.*'([^']*)'")
@@ skipping 36 matching lines @@
     parser.error('missing filename argument')
     return 1
   binary = args[0]
 
   ParseDsymutil(binary)
   return 0
 
 
 if '__main__' == __name__:
   sys.exit(main())