IDL: Add build target for IDL dictionary impl generation in core

Source/bindings/scripts/scripts.gypi

 # 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.
 
 {
   'variables': {
     'bindings_scripts_dir': '.',
     'bindings_scripts_output_dir': '<(SHARED_INTERMEDIATE_DIR)/blink/bindings/scripts',
     'jinja_module_files': [
       # jinja2/__init__.py contains version string, so sufficient for package
@@ skipping 24 matching lines @@
       'code_generator_v8.py',
       'v8_attributes.py',
       'v8_callback_interface.py',
       'v8_dictionary.py',
       'v8_globals.py',
       'v8_interface.py',
       'v8_methods.py',
       'v8_types.py',
       'v8_utilities.py',
     ],
+    'idl_cache_files': [
+      '<(bindings_scripts_output_dir)/lextab.py',
+      '<(bindings_scripts_output_dir)/parsetab.pickle',
+      '<(bindings_scripts_output_dir)/cached_jinja_templates.stamp',
+    ],
 
     'conditions': [
         # These scripts can skip writing generated files if they are identical
         # to the already existing files, which avoids further build steps, like
         # recompilation. However, a dependency (earlier build step) having a
         # newer timestamp than an output (later build step) confuses some build
         # systems, so only use this on ninja, which explicitly supports this use
         # case (gyp turns all actions into ninja restat rules).
         ['"<(GENERATOR)"=="ninja"', {
           'write_file_only_if_changed': '1',
         }, {
           'write_file_only_if_changed': '0',
         }],
     ],
   },
 }