Context Menus now uses the JSON Schema Compiler.

chrome/common/extensions/api/api.gyp

 # Copyright (c) 2012 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.
 
 {
   'targets': [
     {
       'target_name': 'api',
       'type': 'static_library',
       'sources': [
         '<@(idl_schema_files)',
         '<@(json_schema_files)',
       ],
       'includes': [
         '../../../../build/json_schema_bundle_compile.gypi',
         '../../../../build/json_schema_compile.gypi',
       ],
       'variables': {
         'chromium_code': 1,
         'json_schema_files': [
           'content_settings.json',
+          'context_menus.json',
           'cookies.json',
           'debugger.json',
           'events.json',
           'experimental_record.json',
           'file_browser_handler_internal.json',
           'font_settings.json',
           'history.json',
           'permissions.json',
           'storage.json',
           'tabs.json',
@@ skipping 27 matching lines @@
         }],
         ['OS!="chromeos"', {
           'json_schema_files!': [
             'file_browser_handler_internal.json',
           ],
         }],
       ],
     },
   ],
 }