Add lextab.pyc as an output of the cached_lex_yacc_tables action

Source/bindings/scripts/scripts.gyp

 # Copyright 2014 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.
 
 # Pre-caching steps used internally by the IDL compiler
 #
 # Design doc: http://www.chromium.org/developers/design-documents/idl-build
 
 {
   'includes': [
@@ skipping 14 matching lines @@
     # GN version: //third_party/WebKit/Source/bindings/scripts:cached_lex_yacc_tables
     'target_name': 'cached_lex_yacc_tables',
     'type': 'none',
     'actions': [{
       'action_name': 'cache_lex_yacc_tables',
       'inputs': [
         '<@(idl_lexer_parser_files)',
       ],
       'outputs': [
         '<(bindings_scripts_output_dir)/lextab.py',
+        '<(bindings_scripts_output_dir)/lextab.pyc',
         '<(bindings_scripts_output_dir)/parsetab.pickle',
       ],
       'action': [
         'python',
         'blink_idl_parser.py',
         '<(bindings_scripts_output_dir)',
       ],
       'message': 'Caching PLY lex & yacc lex/parse tables',
     }],
   },
@@ skipping 21 matching lines @@
         'code_generator_v8.py',
         '<(bindings_scripts_output_dir)',
         '<(bindings_scripts_output_dir)/cached_jinja_templates.stamp',
       ],
       'message': 'Caching bytecode of Jinja templates',
     }],
   },
 ################################################################################
   ],  # targets
 }