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

lib/dom/scripts/systemfrog.py

 #!/usr/bin/python
 # Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 # for details. All rights reserved. Use of this source code is governed by a
 # BSD-style license that can be found in the LICENSE file.
 
 """This module provides shared functionality for the systems to generate
 frog binding from the IDL database."""
 
 import os
 from generator import *
@@ skipping 326 matching lines @@
           '    throw new UnsupportedOperationException("Cannot assign element of immutable List.");\n'
           '  }\n',
           TYPE=self._NarrowInputType(element_type))
 
     # TODO(sra): Use separate mixins for mutable implementations of List<T>.
     # TODO(sra): Use separate mixins for typed array implementations of List<T>.
     template_file = 'immutable_list_mixin.darttemplate'
     template = self._system._templates.Load(template_file)
     self._members_emitter.Emit(template, E=DartType(element_type))
 
+  def AmendIndexer(self, element_type):
+    pass
 
   def AddOperation(self, info):
     """
     Arguments:
       info: An OperationInfo object.
     """
     # TODO(vsm): Handle overloads.
     params = info.ParametersImplementationDeclaration(
         lambda type_name: self._NarrowInputType(type_name))
 
     native_string = ''
     if info.declared_name != info.name:
       native_string = " '%s'" % info.declared_name
 
     native_body = dom_frog_native_bodies.get(
         self._interface.id + '.' + info.name, '')
     if native_body:
       native_string = " '''" + native_body + "'''"
 
     self._members_emitter.Emit(
         '\n'
         '  $TYPE $NAME($PARAMS) native$NATIVESTRING;\n',
         TYPE=self._NarrowOutputType(info.type_name),
         NAME=info.name,
         PARAMS=params,
         NATIVESTRING=native_string)
 
   def AddStaticOperation(self, info):
     pass