Experimental parser: add backtracking

tools/gyp/v8.gyp

 # Copyright 2012 the V8 project authors. 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 in the documentation and/or other materials provided
@@ skipping 223 matching lines @@
       ]
     },
     {
       'target_name': 'generated-lexer',
       'type': 'none',
       'variables': {
         'lexer_generator_files': [
           '../../src/lexer/lexer_py.re',
           '../../tools/lexer_generator/__init__.py',
           '../../tools/lexer_generator/automaton.py',
+          '../../tools/lexer_generator/backtracking_generator.py',
           '../../tools/lexer_generator/code_generator.jinja',
           '../../tools/lexer_generator/code_generator.py',
           '../../tools/lexer_generator/dfa.py',
           '../../tools/lexer_generator/dfa_minimizer.py',
           '../../tools/lexer_generator/dfa_optimizer.py',
           '../../tools/lexer_generator/dot_utilities.py',
           '../../tools/lexer_generator/generator.py',
           '../../tools/lexer_generator/key_encoding.py',
           '../../tools/lexer_generator/nfa.py',
           '../../tools/lexer_generator/nfa_builder.py',
@@ skipping 981 matching lines @@
         }],
         ['v8_compress_startup_data=="bz2"', {
           'libraries': [
             '-lbz2',
           ]
         }],
       ],
     },
   ],
 }