Add macro to diff the groups (and their members) in ComputedStyleBase

third_party/WebKit/Source/build/scripts/templates/ComputedStyleBase.h.tmpl

 {% from 'macros.tmpl' import license, print_if %}
 {% from 'fields/field.tmpl' import encode, getter_expression, declare_storage, fieldwise_compare %}
 {% from 'fields/group.tmpl' import define_field_group_class %}
 {{license()}}
 
 #ifndef ComputedStyleBase_h
 #define ComputedStyleBase_h
 
 #include "core/style/ComputedStyleConstants.h"
 #include "core/CoreExport.h"
 #include "core/style/DataRef.h"
+#include "core/style/StyleDifference.h"
 {% for path in include_paths %}
 #include "{{path}}"
 {% endfor %}
 
 {# Each field template has macros that we can call to generate specific
    aspects of the field (e.g. getters, setters).
 #}
 {% import 'fields/keyword.tmpl' as keyword %}
 {% import 'fields/primitive.tmpl' as primitive %}
 {% import 'fields/monotonic_flag.tmpl' as monotonic_flag %}
@@ skipping 55 matching lines @@
   }
 
   enum IsAtShadowBoundary {
     kAtShadowBoundary,
     kNotAtShadowBoundary,
   };
   void InheritFrom(const ComputedStyleBase& inheritParent,
                    IsAtShadowBoundary isAtShadowBoundary = kNotAtShadowBoundary);
 
   void CopyNonInheritedFromCached(const ComputedStyleBase& other);
+  bool DiffNeedsFullLayoutAndPaintInvalidation(
+      const ComputedStyleBase& other) const;
+  bool ScrollAnchorDisablingPropertyChanged(const ComputedStyleBase& other,
+                                            const StyleDifference&) const;
 
   // Copies the values of any independent inherited properties from the parent
   // style that are marked as inherited by this style.
   void PropagateIndependentInheritedProperties(
       const ComputedStyleBase& parentStyle);
 
   // Fields.
   // TODO(sashab): Remove initialFoo() static methods and update callers to
   // use resetFoo(), which can be more efficient.
 
@@ skipping 38 matching lines @@
 
  private:
   {% for field in computed_style.fields %}
   {{declare_storage(field)}}
   {% endfor %}
 };
 
 } // namespace blink
 
 #endif // ComputedStyleBase_h