Use jinja2 for make_runtime_features and make_internal_runtime_flags

Source/core/scripts/templates/macros.tmpl

Index: Source/core/scripts/templates/macros.tmpl
diff --git a/Source/wtf/text/StringStatics.h b/Source/core/scripts/templates/macros.tmpl
similarity index 85%
copy from Source/wtf/text/StringStatics.h
copy to Source/core/scripts/templates/macros.tmpl
index 73097bc5cdbaf2e17318bd93cdcb1c445f676b27..ce927432acafb4c70af3b7bba98f1ca814e144c3 100644
--- a/Source/wtf/text/StringStatics.h
+++ b/Source/core/scripts/templates/macros.tmpl
@@ -1,3 +1,17 @@
+{% macro wrap_with_condition(condition) %}
+{%- if condition %}
+#if ENABLE({{condition}})
+{{- caller() }}
+#endif
+{%- else %}
+{{- caller() }}
+{%- endif %}
+{%- endmacro %}
+
+{#
+    FIXME: Do we need to put license blocks in generated files?
+#}
+{% macro license() -%}
 /*
  * Copyright (C) 2013 Google Inc. All rights reserved.
  *
@@ -27,20 +41,4 @@
  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
-
-#ifndef StringStatics_h
-#define StringStatics_h
-
-namespace WTF {
-
-class StringStatics {
-public:
-    static void init();
-
-private:
-    StringStatics();
-};
-
-}
-
-#endif
+{%- endmacro %}