Refined types for most HtmlElement factory constructors

tools/dom/scripts/systemnative.py

Index: tools/dom/scripts/systemnative.py
diff --git a/tools/dom/scripts/systemnative.py b/tools/dom/scripts/systemnative.py
index 659d24cbe815a55cd0277597d817b5657121a197..1df7f8cf952559d865f0ba709e3cc761d1e353e3 100644
--- a/tools/dom/scripts/systemnative.py
+++ b/tools/dom/scripts/systemnative.py
@@ -308,6 +308,13 @@ class DartiumBackend(HtmlDartGenerator):
   def IsConstructorArgumentOptional(self, argument):
     return IsOptional(argument)
 
+  def MakeFactoryCall(self, factory, method, arguments, constructor_info):
+    return emitter.Format(
+        '$FACTORY.$METHOD($ARGUMENTS)',
+        FACTORY=factory,
+        METHOD=method,
+        ARGUMENTS=arguments)
+
   def EmitStaticFactoryOverload(self, constructor_info, name, arguments):
     constructor_callback_cpp_name = name + 'constructorCallback'
     self._EmitConstructorInfrastructure(