IDL: Add any support to IDL dictionary and use it in CustomEventInit

Source/bindings/scripts/v8_dictionary.py

 # Copyright 2014 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 """Generate template contexts of dictionaries for both v8 bindings and
 implementation classes that are used by blink's core/modules.
 """
 
 import operator
 from idl_types import IdlType
@@ skipping 147 matching lines @@
             dictionary.parent, interfaces_info)
         parent_interface_info = interfaces_info.get(dictionary.parent)
         if parent_interface_info:
             context['header_includes'].add(
                 parent_interface_info['include_path'])
     return context
 
 
 def member_impl_context(member, interfaces_info, header_includes):
     idl_type = unwrap_nullable_if_needed(member.idl_type)
-    is_object = idl_type.name == 'Object'
     cpp_name = v8_utilities.cpp_name(member)
 
     def getter_expression():
         if idl_type.impl_should_use_nullable_container:
             return 'm_%s.get()' % cpp_name
         return 'm_%s' % cpp_name
 
     def has_method_expression():
         if idl_type.impl_should_use_nullable_container or idl_type.is_enum or idl_type.is_string_type or idl_type.is_union_type:
             return '!m_%s.isNull()' % cpp_name
-        elif is_object:
+        elif idl_type.name in ['Any', 'Object']:
             return '!(m_{0}.isEmpty() || m_{0}.isNull() || m_{0}.isUndefined())'.format(cpp_name)
         else:
             return 'm_%s' % cpp_name
 
     def member_cpp_type():
         member_cpp_type = idl_type.cpp_type_args(used_in_cpp_sequence=True)
         if idl_type.impl_should_use_nullable_container:
             return v8_types.cpp_template_type('Nullable', member_cpp_type)
         return member_cpp_type
 
     cpp_default_value = None
     if member.default_value and not member.default_value.is_null:
         cpp_default_value = idl_type.literal_cpp_value(member.default_value)
 
     header_includes.update(idl_type.impl_includes_for_type(interfaces_info))
     return {
         'cpp_default_value': cpp_default_value,
         'cpp_name': cpp_name,
         'getter_expression': getter_expression(),
         'has_method_expression': has_method_expression(),
         'has_method_name': has_method_name_for_dictionary_member(member),
-        'is_object': is_object,
         'is_traceable': idl_type.is_traceable,
         'member_cpp_type': member_cpp_type(),
         'null_setter_name': null_setter_name_for_dictionary_member(member),
         'rvalue_cpp_type': idl_type.cpp_type_args(used_as_rvalue_type=True),
         'setter_name': setter_name_for_dictionary_member(member),
     }