Fix factory dart:html typed array providers for dartium.

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 633 matching lines @@
           PARAMS=constructor_info.ParametersInterfaceDeclaration());
 
     element_type = MaybeTypedArrayElementType(self._interface)
     if element_type:
       self._members_emitter.Emit(
           '\n'
           '  $CTOR(int length);\n'
           '\n'
           '  $CTOR.fromList(List<$TYPE> list);\n'
           '\n'
-          '  $CTOR.fromBuffer(ArrayBuffer buffer);\n',
+          '  $CTOR.fromBuffer(ArrayBuffer buffer,'
+                            ' [int byteOffset, int length]);\n',
         CTOR=self._interface.id,
         TYPE=DartType(element_type))
 
     emit_events, events = self._shared.GetEventAttributes(self._interface)
     if not emit_events:
       return
     elif events:
       self.AddEventAttributes(events)
     else:
       self._EmitEventGetter(self._shared.GetParentEventsClass(self._interface))
@@ skipping 1048 matching lines @@
     # dispatch has removed f(X), leaving only f(Y), but there is no guarantee
     # that Y = Z-X, so we need to check for Y.
     true_code = emitter.Emit(
         '$(INDENT)if ($COND) {\n'
         '$!TRUE'
         '$(INDENT)}\n',
         COND=test, INDENT=indent)
     self.GenerateDispatch(
         true_code, info, indent + '  ', position + 1, positive)
     return True