Pre-cache PLY lex table and use optimized mode (5% build time improvement)

Tools/Scripts/webkitpy/bindings/main.py

 # Copyright (C) 2011 Google Inc.  All rights reserved.
 #
 # Redistribution and use in source and binary forms, with or without
 # modification, are permitted provided that the following conditions
 # are met:
 # 1. Redistributions of source code must retain the above copyright
 #    notice, this list of conditions and the following disclaimer.
 # 2. Redistributions in binary form must reproduce the above copyright
 #    notice, this list of conditions and the following disclaimer in the
 #    documentation and/or other materials provided with the distribution.
@@ skipping 196 matching lines @@
             return False
 
         if self.verbose:
             print 'PASS: %s' % reference_basename
         return True
 
     def identical_output_files(self):
         file_pairs = [(os.path.join(reference_directory, output_file),
                        os.path.join(self.output_directory, output_file))
                       for output_file in os.listdir(self.output_directory)
-                      # Skip cache
-                      if not output_file.endswith(('.pickle',  # PLY yacc
-                                                   '.cache',  # Jinja
-                                                   ))]
+                      # Skip caches
+                      if not (output_file in ('lextab.py',  # PLY lex
+                                              'lextab.pyc',
+                                              'parsetab.pickle') or  # PLY yacc
+                              output_file.endswith('.cache'))]  # Jinja
         return all([self.identical_file(reference_filename, output_filename)
                     for (reference_filename, output_filename) in file_pairs])
 
     def no_excess_files(self):
         generated_files = set(os.listdir(self.output_directory))
         generated_files.add('.svn')  # Subversion working copy directory
         generated_files.add('EventInterfaces.in')  # only in Perl, not Python
         excess_files = [output_file
                         for output_file in os.listdir(reference_directory)
                         if output_file not in generated_files]
@@ skipping 42 matching lines @@
                 print PASS_MESSAGE
             return 0
         print
         print FAIL_MESSAGE
         return -1
 
 
 def run_bindings_tests(reset_results, verbose):
     with ScopedTempFileProvider() as provider:
         return BindingsTests(reset_results, verbose, provider).main()