Support overloaded 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 9efdddb4ec74e57d1a1a4b137feac127ce3e85cc..661c693d59b5886f4468bedd46fc65dcc12a46ba 100644
--- a/tools/dom/scripts/systemnative.py
+++ b/tools/dom/scripts/systemnative.py
@@ -160,24 +160,31 @@ class DartiumBackend(HtmlDartGenerator):
         CLASSNAME=self._interface_type_info.implementation_name(),
         SUPERCONSTRUCTOR=super_constructor)
 
-  def EmitStaticFactory(self, constructor_info):
-    constructor_callback_id = self._interface.id + '_constructor_Callback'
+  def HasCustomFactory(self):
+    return False
+
+  def IsConstructorArgumentOptional(self, argument):
+    return False
+
+  def EmitStaticFactoryOverload(self, constructor_info, name, arguments):
+    constructor_callback_cpp_name = name + '_constructor_Callback'
+    constructor_callback_id = self._interface.id + constructor_callback_cpp_name
 
     self._members_emitter.Emit(
-        '  static $INTERFACE_NAME _create($PARAMETERS_DECLARATION) '
+        '  static $INTERFACE_NAME $NAME($PARAMETERS) '
           'native "$CONSTRUCTOR_CALLBACK_ID";\n',
         INTERFACE_NAME=self._interface_type_info.interface_name(),
-        PARAMETERS_DECLARATION=constructor_info.ParametersDeclaration(
-            self._DartType),
+        NAME=name,
+        # TODO: add types to parameters.
+        PARAMETERS=constructor_info.ParametersAsArgumentList(len(arguments)),
         CONSTRUCTOR_CALLBACK_ID=constructor_callback_id)
 
-    # TODO(antonm): currently we don't have information about number of arguments expected by
-    # the constructor, so name only dispatch.
     self._cpp_resolver_emitter.Emit(
         '    if (name == "$CONSTRUCTOR_CALLBACK_ID")\n'
-        '        return Dart$(WEBKIT_INTERFACE_NAME)Internal::constructorCallback;\n',
+        '        return Dart$(WEBKIT_INTERFACE_NAME)Internal::$NAME;\n',
         CONSTRUCTOR_CALLBACK_ID=constructor_callback_id,
-        WEBKIT_INTERFACE_NAME=self._interface.id)
+        WEBKIT_INTERFACE_NAME=self._interface.id,
+        NAME=constructor_callback_cpp_name)
 
     ext_attrs = self._interface.ext_attrs
 
@@ -185,7 +192,8 @@ class DartiumBackend(HtmlDartGenerator):
       # We have a custom implementation for it.
       self._cpp_declarations_emitter.Emit(
           '\n'
-          'void constructorCallback(Dart_NativeArguments);\n')
+          'void $NAME(Dart_NativeArguments);\n',
+          NAME=constructor_callback_cpp_name)
       return
 
     create_function = 'create'
@@ -193,11 +201,11 @@ class DartiumBackend(HtmlDartGenerator):
       create_function = 'createForJSConstructor'
     function_expression = '%s::%s' % (self._interface_type_info.native_type(), create_function)
     self._GenerateNativeCallback(
-        'constructorCallback',
+        constructor_callback_cpp_name,
         False,
         function_expression,
         self._interface,
-        constructor_info.idl_args,
+        arguments,
         self._interface.id,
         'ConstructorRaisesException' in ext_attrs)