Better support for the case of typed arrays inheriting from other typed arrays.

lib/dom/scripts/systemhtml.py

Index: lib/dom/scripts/systemhtml.py
diff --git a/lib/dom/scripts/systemhtml.py b/lib/dom/scripts/systemhtml.py
index 480c13d8575888d94df32a3b396aebbdb9514bff..fa52e9eb9d39868d1bc689b05e3f4ce00085d773 100644
--- a/lib/dom/scripts/systemhtml.py
+++ b/lib/dom/scripts/systemhtml.py
@@ -605,10 +605,10 @@ class HtmlInterfacesSystem(HtmlSystem):
       template = self._templates.Load('interface.darttemplate')
 
     return HtmlDartInterfaceGenerator(
-        interface, dart_interface_code,
+        self, interface, dart_interface_code,
         template,
         common_prefix, super_interface_name,
-        source_filter, self, self._shared)
+        source_filter, self._shared)
 
   def ProcessCallback(self, interface, info):
     """Generates a typedef for the callback interface."""
@@ -633,11 +633,10 @@ class HtmlInterfacesSystem(HtmlSystem):
 class HtmlDartInterfaceGenerator(DartInterfaceGenerator):
   """Generates Dart Interface definition for one DOM IDL interface."""
 
-  def __init__(self, interface, emitter, template,
-               common_prefix, super_interface, source_filter, system, shared):
-    super(HtmlDartInterfaceGenerator, self).__init__(interface,
+  def __init__(self, system, interface, emitter, template,
+               common_prefix, super_interface, source_filter, shared):
+    super(HtmlDartInterfaceGenerator, self).__init__(system, interface,
       emitter, template, common_prefix, super_interface, source_filter)
-    self._system = system
     self._shared = shared
 
   def StartInterface(self):