Move interface merging info to type registry.

lib/html/scripts/systemnative.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 systems to generate
 native binding from the IDL database."""
 
 import emitter
 import os
 from generator import *
 from systemhtml import SecureOutputType
 
 class DartiumBackend(object):
   """Generates Dart implementation for one DOM IDL interface."""
 
   def __init__(self, interface, cpp_library_emitter, options):
     self._interface = interface
     self._cpp_library_emitter = cpp_library_emitter
     self._database = options.database
     self._template_loader = options.templates
     self._type_registry = options.type_registry
     self._html_interface_name = options.renamer.RenameInterface(self._interface)
 
-  def HasImplementation(self):
-    return not IsPureInterface(self._interface.id)
-
   def ImplementationClassName(self):
     return self._ImplClassName(self._interface.id)
 
   def ImplementsMergedMembers(self):
     # We could not add merged functions to implementation class because
     # underlying c++ object doesn't implement them. Merged functions are
     # generated on merged interface implementation instead.
     return False
 
   def CustomJSMembers(self):
@@ skipping 69 matching lines @@
     return template
 
   def AdditionalImplementedInterfaces(self):
     return []
 
   def NativeSpec(self):
     return ''
 
   def StartInterface(self, memebers_emitter):
     # Create emitters for c++ implementation.
-    if self.HasImplementation():
+    if not IsPureInterface(self._interface.id):
       self._cpp_header_emitter = self._cpp_library_emitter.CreateHeaderEmitter(self._interface.id)
       self._cpp_impl_emitter = self._cpp_library_emitter.CreateSourceEmitter(self._interface.id)
     else:
       self._cpp_header_emitter = emitter.Emitter()
       self._cpp_impl_emitter = emitter.Emitter()
 
     self._interface_type_info = self._TypeInfo(self._interface.id)
     self._members_emitter = memebers_emitter
     self._cpp_declarations_emitter = emitter.Emitter()
     self._cpp_impl_includes = set()
@@ skipping 758 matching lines @@
   def EmitResolver(self, template, output_dir):
     file_path = os.path.join(output_dir, 'DartResolver.cpp')
     includes_emitter, body_emitter = self._emitters.FileEmitter(file_path).Emit(template)
     for header_file in self._headers_list:
       path = os.path.relpath(header_file, output_dir)
       includes_emitter.Emit('#include "$PATH"\n', PATH=path)
       body_emitter.Emit(
           '    if (Dart_NativeFunction func = $CLASS_NAME::resolver(name, argumentCount))\n'
           '        return func;\n',
           CLASS_NAME=os.path.splitext(os.path.basename(path))[0])