Improve TypeError messages from failed array conversions.

Source/bindings/scripts/unstable/v8_types.py

 # Copyright (C) 2013 Google Inc. All rights reserved.
 #
 # Redistribution and use in source and binary forms, with or without
 # modification, are permitted provided that the following conditions are
 # met:
 #
 #     * Redistributions of source code must retain the above copyright
 # notice, this list of conditions and the following disclaimer.
 #     * Redistributions in binary form must reproduce the above
 # copyright notice, this list of conditions and the following disclaimer
@@ skipping 375 matching lines @@
             'V8{idl_type}::HasInstance({v8_value}, {isolate}, worldType({isolate})) ? '
             'V8{idl_type}::toNative(v8::Handle<v8::Object>::Cast({v8_value})) : 0')
         includes.update(includes_for_type(idl_type))
 
     return cpp_expression_format.format(arguments=arguments, idl_type=idl_type, isolate=isolate, v8_value=v8_value)
 
 
 def v8_value_to_cpp_value_array_or_sequence(this_array_or_sequence_type, v8_value, includes, isolate):
     if is_interface_type(this_array_or_sequence_type):
         this_cpp_type = None
-        expression_format = '(toRefPtrNativeArray<{array_or_sequence_type}, V8{array_or_sequence_type}>({v8_value}, {isolate}))'
+        expression_format = '(toRefPtrNativeArray<{array_or_sequence_type}, V8{array_or_sequence_type}>({v8_value}, 0, {isolate}))'
         includes.add('V8%s.h' % this_array_or_sequence_type)
     else:
         this_cpp_type = cpp_type(this_array_or_sequence_type)
-        expression_format = 'toNativeArray<{cpp_type}>({v8_value}, {isolate})'
+        expression_format = 'toNativeArray<{cpp_type}>({v8_value}, 0, {isolate})'
     expression = expression_format.format(array_or_sequence_type=this_array_or_sequence_type, cpp_type=this_cpp_type, isolate=isolate, v8_value=v8_value)
     return expression
 
 
 def v8_value_to_local_cpp_value(idl_type, extended_attributes, v8_value, variable_name, includes, isolate):
     """Returns an expression that converts a V8 value to a C++ value and stores it as a local value."""
     this_cpp_type = cpp_type(idl_type, extended_attributes=extended_attributes, used_as_argument=True)
 
     idl_type = preprocess_idl_type(idl_type)
     if idl_type == 'DOMString':
@@ skipping 149 matching lines @@
 }
 
 
 def cpp_value_to_v8_value(idl_type, cpp_value, includes, isolate, callback_info='', creation_context='', extended_attributes=None):
     """Returns an expression that converts a C++ value to a V8 value."""
     idl_type, cpp_value = preprocess_idl_type_and_value(idl_type, cpp_value, extended_attributes)
     this_v8_conversion_type = v8_conversion_type(idl_type, extended_attributes, includes)
     format_string = CPP_VALUE_TO_V8_VALUE[this_v8_conversion_type]
     statement = format_string.format(callback_info=callback_info, cpp_value=cpp_value, creation_context=creation_context, isolate=isolate)
     return statement