Add support in generate scripts to handle Conditional

Source/build/scripts/templates/MakeNames.cpp.tmpl

 {% from "macros.tmpl" import license %}
 {{ license() }}
 
 #include "config.h"
 
 #ifdef SKIP_STATIC_CONSTRUCTORS_ON_GCC
 #define {{namespace|to_macro_style}}_NAMES_HIDE_GLOBALS 1
 #endif
 
 #include "{{namespace}}{{suffix}}Names.h"
 
 #include "wtf/StaticConstructors.h"
 
 namespace WebCore {
 namespace {{namespace}}Names {
 
 using namespace WTF;
 
 {% for entry in entries|sort %}
+{% filter enable_conditional(entry.Conditional) %}
 {% if export %}
 DEFINE_GLOBAL(AtomicString, {{entry|symbol}}Storage)
 {{export}} const AtomicString& {{entry|symbol}} = *reinterpret_cast<const AtomicString*>(&{{entry|symbol}}Storage);
 {% else %}
 DEFINE_GLOBAL(AtomicString, {{entry|symbol}})
 {% endif %}
+{% endfilter %}
 {% endfor %}
 
 void init{{suffix}}()
 {
     {% for entry in entries|sort %}
+    {% filter enable_conditional(entry.Conditional) %}
     StringImpl* {{entry|symbol}}Impl = StringImpl::createStatic("{{entry|cpp_name}}", {{entry|cpp_name|length}}, {{entry|cpp_name|hash}});
+    {% endfilter %}
     {% endfor %}
 
     {% for entry in entries|sort %}
+    {% filter enable_conditional(entry.Conditional) %}
     new ((void*)&{{entry|symbol}}) AtomicString({{entry|symbol}}Impl);
+    {% endfilter %}
     {% endfor %}
 }
 
 } // {{namespace}}Names
 } // WebCore