Add support in generate scripts to handle Conditional

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

Index: Source/build/scripts/templates/ElementFactory.cpp.tmpl
diff --git a/Source/build/scripts/templates/ElementFactory.cpp.tmpl b/Source/build/scripts/templates/ElementFactory.cpp.tmpl
index cc439824fd1d0850f123cabc54ab63f86afc47f8..183de26db325d944de9350422dfc1d6349ea1d13 100644
--- a/Source/build/scripts/templates/ElementFactory.cpp.tmpl
+++ b/Source/build/scripts/templates/ElementFactory.cpp.tmpl
@@ -35,6 +35,7 @@ typedef HashMap<AtomicString, ConstructorFunction> FunctionMap;
 static FunctionMap* g_constructors = 0;
 
 {% for tag in tags|sort if not tag.noConstructor %}
+{% filter enable_conditional(tag.Conditional) %}
 static PassRefPtrWillBeRawPtr<{{namespace}}Element> {{tag|symbol}}Constructor(
     Document& document,
     {% if namespace == 'HTML' %}
@@ -57,6 +58,7 @@ static PassRefPtrWillBeRawPtr<{{namespace}}Element> {{tag|symbol}}Constructor(
         {%- if tag.constructorNeedsCreatedByParser %}, createdByParser{% endif -%}
     );
 }
+{% endfilter %}
 {% endfor %}
 
 struct Create{{namespace}}FunctionMapData {
@@ -68,9 +70,13 @@ static void create{{namespace}}FunctionMap()
 {
     ASSERT(!g_constructors);
     g_constructors = new FunctionMap;
+    // Empty array initializer lists are illegal [dcl.init.aggr] and will not
+    // compile in MSVC. If tags list is empty, add check to skip this.
     static const Create{{namespace}}FunctionMapData data[] = {
     {% for tag in tags|sort if not tag.noConstructor %}
+    {% filter enable_conditional(tag.Conditional) %}
         { {{tag|symbol}}Tag, {{tag|symbol}}Constructor },
+    {% endfilter %}
     {% endfor %}
     };
     for (size_t i = 0; i < WTF_ARRAY_LENGTH(data); i++)