Introduce Promise mapping to the IDL generator

Source/bindings/scripts/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 28 matching lines @@
     'byte',
     'long',
     'short',
 ])
 CPP_UNSIGNED_TYPES = set([
     'octet',
     'unsigned int',
     'unsigned long',
     'unsigned short',
 ])
+# Promise is not yet in the Web IDL spec but is going to be speced
+# as primitive types in the future.
+# Since V8 dosn't provide Promise primitive object currently,
+# PRIMITIVE_TYPES doesn't contain Promise.
 CPP_TYPE_SPECIAL_CONVERSION_RULES = {
     'boolean': 'bool',
     'DOMString': 'const String&',
+    'Promise': 'ScriptPromise',
 }
 PRIMITIVE_TYPES = set([
      # http://www.w3.org/TR/WebIDL/#dfn-primitive-type
     'boolean',
     'float',
     # unrestricted float is not supported
     'double',
     # unrestricted double is not supported
     # integer types
     # http://www.w3.org/TR/WebIDL/#dfn-integer-type
@@ skipping 95 matching lines @@
     if this_cpp_type in V8_SET_RETURN_VALUE_DICT:
         expression_format_string = V8_SET_RETURN_VALUE_DICT[this_cpp_type]
     else:
         raise Exception('unexpected IDL type %s' % idl_type)
     return expression_format_string.format(callback_info=callback_info, cpp_value=cpp_value)
 
 
 def includes_for_type(idl_type):
     if primitive_type(idl_type) or idl_type == 'DOMString':
         return set()
+    if idl_type == 'Promise':
+        return set(['ScriptPromise.h'])
     this_array_or_sequence_type = array_or_sequence_type(idl_type)
     if this_array_or_sequence_type:
         return includes_for_type(this_array_or_sequence_type)
     return set(['V8%s.h' % idl_type])