Auto generate UseCounter::Feature enum from an .in file

Source/core/core_generated.gyp

 #
 # 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
@@ skipping 777 matching lines @@
             '<(blink_core_output_dir)/HTMLElementLookupTrie.h',
           ],
           'action': [
             'python',
             '../build/scripts/make_element_lookup_trie.py',
             'html/HTMLTagNames.in',
             '--output_dir',
             '<(blink_core_output_dir)',
           ],
         },
+      {

[Timothy Loh, 2014/11/24 11:02:40]

You almost certainly need to edit a GN file somewhere

+          'action_name': 'UseCounter',
+          'inputs': [
+            '<@(scripts_for_in_files)',
+            '../build/scripts/make_use_counter.py',
+            '../build/scripts/templates/UseCounterGenerated.h.tmpl',
+            'frame/UseCounterGenerated.in',
+          ],
+          'outputs': [
+            '<(blink_core_output_dir)/UseCounterGenerated.h',
+          ],
+          'action': [
+            'python',
+            '../build/scripts/make_use_counter.py',
+            'frame/UseCounterGenerated.in',
+            '--output_dir',
+            '<(blink_core_output_dir)',
+          ],
+        },
       ],
       'rules': [
         {
           'rule_name': 'bison',
           'extension': 'y',
           'outputs': [
             '<(blink_core_output_dir)/<(RULE_INPUT_ROOT).cpp',
             '<(blink_core_output_dir)/<(RULE_INPUT_ROOT).h'
           ],
           'action': [
             'python',
             '../build/scripts/rule_bison.py',
             '<(RULE_INPUT_PATH)',
             '<(blink_core_output_dir)',
             '<(bison_exe)',
           ],
         },
       ],
     },
   ],
 }