Changing metadata lookup to always use interface.id

tools/dom/scripts/htmldartgenerator.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."""
 
 import emitter
 from generator import AnalyzeOperation, ConstantOutputOrder, \
@@ skipping 339 matching lines @@
     for constructor_info in constructors:
       self._AddConstructor(
           constructor_info, factory_name, factory_constructor_name)
 
   def _AddConstructor(self,
       constructor_info, factory_name, factory_constructor_name):
     if self.GenerateCustomFactory(constructor_info):
       return
 
     metadata = self._metadata.GetFormattedMetadata(
-        self._library_name, self._interface.id, self._interface.id, '  ')
+        self._library_name, self._interface, self._interface.id, '  ')
 
     if not factory_constructor_name:
       factory_constructor_name = '_create'
       factory_parameters = constructor_info.ParametersAsArgumentList()
       has_factory_provider = True
     else:
       factory_parameters = ', '.join(constructor_info.factory_parameters)
       has_factory_provider = False
 
     if constructor_info.pure_dart_constructor:
@@ skipping 226 matching lines @@
     if interface.parents:
       parent = interface.parents[0]
       if IsPureInterface(parent.type.id):
         walk(interface.parents)
       else:
         walk(interface.parents[1:])
     return result
 
   def _DartType(self, type_name):
     return self._type_registry.DartType(type_name)