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

Source/bindings/scripts/blink_idl_parser.py

 # Copyright (C) 2013 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:
 #
 #     * Redistributions of source code must retain the above copyright
 # notice, this list of conditions and the following disclaimer.
 #     * Redistributions in binary form must reproduce the above
 # copyright notice, this list of conditions and the following disclaimer
@@ skipping 402 matching lines @@
         if debug:
             # Turn off optimization and caching, and write out tables,
             # to help debugging
             optimize = False
             outputdir = None
             picklefile = None
             write_tables = True
         if outputdir:
             picklefile = picklefile or os.path.join(outputdir, 'parsetab.pickle')
 
-        lexer = lexer or BlinkIDLLexer()
+        lexer = lexer or BlinkIDLLexer(debug=debug,
+                                       outputdir=outputdir,
+                                       optimize=optimize)
         self.lexer = lexer
         self.tokens = lexer.KnownTokens()
         # Using SLR (instead of LALR) generates the table faster,
         # but produces the same output. This is ok b/c Web IDL (and Blink IDL)
         # is an SLR grammar (as is often the case for simple LL(1) grammars).
         #
         # Optimized mode substantially decreases startup time (by disabling
         # error checking), and also allows use of Python's optimized mode.
         # See: Using Python's Optimized Mode
         # http://www.dabeaz.com/ply/ply.html#ply_nn38
@@ skipping 26 matching lines @@
     try:
         outputdir = argv[1]
     except IndexError as err:
         print 'Usage: %s OUTPUT_DIR' % argv[0]
         return 1
     parser = BlinkIDLParser(outputdir=outputdir)
 
 
 if __name__ == '__main__':
     sys.exit(main(sys.argv))