Exploit sharing when comparing and copying groups in ComputedStyle.

third_party/WebKit/Source/build/scripts/make_computed_style_base.py

 #!/usr/bin/env python
 # Copyright 2016 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.
 
 import math
 import sys
 
 import json5_generator
 import template_expander
@@ skipping 407 matching lines @@
         # is ComputedStyleBase.
         self._root_group = _group_fields(all_fields)
 
         self._include_paths = _get_include_paths(all_properties)
         self._outputs = {
             'ComputedStyleBase.h': self.generate_base_computed_style_h,
             'ComputedStyleBase.cpp': self.generate_base_computed_style_cpp,
             'ComputedStyleBaseConstants.h': self.generate_base_computed_style_constants,
         }
 
-    @template_expander.use_jinja('ComputedStyleBase.h.tmpl')
+    @template_expander.use_jinja('ComputedStyleBase.h.tmpl', tests={'in': lambda a, b: a in b})
     def generate_base_computed_style_h(self):
         return {
             'properties': self._properties,
             'enums': self._generated_enums,
             'include_paths': self._include_paths,
             'computed_style': self._root_group,
         }
 
-    @template_expander.use_jinja('ComputedStyleBase.cpp.tmpl')
+    @template_expander.use_jinja('ComputedStyleBase.cpp.tmpl', tests={'in': lambda a, b: a in b})
     def generate_base_computed_style_cpp(self):
         return {
             'properties': self._properties,
             'enums': self._generated_enums,
             'computed_style': self._root_group,
         }
 
     @template_expander.use_jinja('ComputedStyleBaseConstants.h.tmpl')
     def generate_base_computed_style_constants(self):
         return {
             'properties': self._properties,
             'enums': self._generated_enums,
         }
 
 if __name__ == '__main__':
     json5_generator.Maker(ComputedStyleBaseWriter).main()