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..722fe9be4dbd3d59532e8359927d1c7a9d12faca 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;
+    // FIXME: Compilation on MSVC will fail if data[] is empty. Zero size arrays

[Nils Barth (inactive), 2014/06/16 06:27:52]

I wouldn't make this a FIXME;
it's fine to just have a note, since if this is ever triggered,
compilation will fail exactly here.

Also, this is not MSVC-specific: it's C++ standard.

Thus I'd write this as:
// 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.

+    // not allowed in MSVC. Make sure tags list is not empty. 
     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++)