IDL: Generate union type containers

Source/bindings/scripts/code_generator_v8.py

Index: Source/bindings/scripts/code_generator_v8.py
diff --git a/Source/bindings/scripts/code_generator_v8.py b/Source/bindings/scripts/code_generator_v8.py
index 10ceed630ad1ece6e5079ca4b306b7e7b986abee..6462ba304efe2bf5814a2b06882762e7b22247b5 100644
--- a/Source/bindings/scripts/code_generator_v8.py
+++ b/Source/bindings/scripts/code_generator_v8.py
@@ -266,9 +266,12 @@ class CodeGeneratorUnionTypeContainers(object):
         header_template = self.jinja_env.get_template('union.h')
         cpp_template = self.jinja_env.get_template('union.cpp')
         template_context = v8_union.union_context(
-            sorted(union_types, key=lambda union_type: union_type.name))
+            sorted(union_types, key=lambda union_type: union_type.name),
+            self.interfaces_info)
         template_context['code_generator'] = module_pyname
         capitalized_component = self.target_component.capitalize()
+        template_context['header_filename'] = 'bindings/%s/v8/UnionTypes%s.h' % (
+            self.target_component, capitalized_component)
         template_context['macro_guard'] = 'UnionType%s_h' % capitalized_component
         header_text = header_template.render(template_context)
         cpp_text = cpp_template.render(template_context)