Add support for generating external types in ComputedStyleBase.

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

 {% from 'macros.tmpl' import license, print_if %}
 {{license()}}
 
 #ifndef ComputedStyleBase_h
 #define ComputedStyleBase_h
 
 #include "core/ComputedStyleBaseConstants.h"
 #include "core/CoreExport.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/flag.tmpl' as flag %}
 {% import 'fields/monotonic_flag.tmpl' as monotonic_flag %}
-{% set field_templates = { 'keyword': keyword, 'flag': flag, 'monotonic_flag': monotonic_flag } %}
+{% import 'fields/external.tmpl' as external %}
+{% set field_templates = {
+     'keyword': keyword,
+     'flag': flag,
+     'monotonic_flag': monotonic_flag,
+     'external': external
+   } %}
 
 namespace blink {
 
 // The generated portion of ComputedStyle. For more info, see the header comment
 // in ComputedStyle.h.
 class CORE_EXPORT ComputedStyleBase {
  public:
   ALWAYS_INLINE ComputedStyleBase() :
   {% for field in fields %}
+      {% if field.is_packed %}
       {{field.name}}(static_cast<unsigned>({{field.default_value}})){{print_if(not loop.last, ',')}}
+      {% else %}
+      {{field.name}}({{field.default_value}}){{print_if(not loop.last, ',')}}
+      {% endif %}
   {% endfor %}
   {}
   ~ComputedStyleBase() {}
 
   ALWAYS_INLINE ComputedStyleBase(const ComputedStyleBase& o) :
   {% for field in fields %}
       {{field.name}}(o.{{field.name}}){{print_if(not loop.last, ',')}}
   {% endfor %}
   {}
 
@@ skipping 58 matching lines @@
   // use resetFoo(), which can be more efficient.
 
   {% for field in fields %}
   // {{field.property_name}}
   {{field_templates[field.field_template].decl_methods(field)|indent(2)}}
 
   {% endfor %}
  protected:
   // Storage.
   {% for field in fields %}
+  {% if field.is_packed %}
   unsigned {{field.name}} : {{field.size}}; // {{field.type_name}}
+  {% else %}
+  {{field.type_name}} {{field.name}};
+  {% endif %}
   {% endfor %}
 };
 
 } // namespace blink
 
 #endif // ComputedStyleBase_h