Use JavaScriptIndexingBehavior on typed arrays.

lib/dom/scripts/systemhtml.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 system to generate
 Dart:html APIs from the IDL database."""
 
 from systemfrog import *
 from systeminterface import *
@@ skipping 1046 matching lines @@
 
     native_spec = MakeNativeSpec(interface.javascript_binding_name)
 
     extends = ' extends ' + base if base else ''
 
     # TODO: Include all implemented interfaces, including other Lists.
     implements = [self._html_interface_name]
     element_type = MaybeTypedArrayElementType(self._interface)
     if element_type:
       implements.append('List<%s>' % self._shared.DartType(element_type))
+      implements.append('JavaScriptIndexingBehavior')
 
     self._members_emitter = self._dart_code.Emit(
         self._template,
         #class $CLASSNAME$EXTENDS$IMPLEMENTS$NATIVESPEC {
         #$!MEMBERS
         #}
         CLASSNAME=self._class_name,
         EXTENDS=extends,
         IMPLEMENTS=' implements ' + ', '.join(implements),
         NATIVESPEC=' native "' + native_spec + '"')
@@ skipping 379 matching lines @@
             Collect(database.GetInterface(parent.type.id),
                     seen, collected)
 
   inheritance_closure = {}
   for interface in database.GetInterfaces():
     seen = set()
     collected = []
     Collect(interface, seen, collected)
     inheritance_closure[interface.id] = collected
   return inheritance_closure