Implement ReadableStream as a V8 extra

Source/bindings/scripts/idl_types.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.
 """IDL type handling.
 
 Classes:
 IdlTypeBase
  IdlType
  IdlUnionType
  IdlArrayOrSequenceType
@@ skipping 197 matching lines @@
         # Anything that is not another type is an interface type.
         # http://www.w3.org/TR/WebIDL/#idl-types
         # http://www.w3.org/TR/WebIDL/#idl-interface
         # In C++ these are RefPtr or PassRefPtr types.
         return not(self.is_basic_type or
                    self.is_callback_function or
                    self.is_dictionary or
                    self.is_enum or
                    self.name == 'Any' or
                    self.name == 'Object' or
-                   self.name == 'Promise')  # Promise will be basic in future
+                   self.name == 'Promise' or
+                   self.name == 'ReadableStream2')  # Promise will be basic in future
 
     @property
     def is_string_type(self):
         return self.name in STRING_TYPES
 
     @property
     def name(self):
         """Return type name
 
         http://heycam.github.io/webidl/#dfn-type-name
@@ skipping 206 matching lines @@
         return self.inner_type.name + 'OrNull'
 
     def resolve_typedefs(self, typedefs):
         self.inner_type = self.inner_type.resolve_typedefs(typedefs)
         return self
 
     def idl_types(self):
         yield self
         for idl_type in self.inner_type.idl_types():
             yield idl_type