Emit secondary members in the fixed order.

lib/html/scripts/systemhtml.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
 import os
@@ skipping 392 matching lines @@
       operations = operationsById[id]
       info = AnalyzeOperation(interface, operations)
       self.AddOperation(info)
 
   def AddSecondaryMembers(self, interface):
     # With multiple inheritance, attributes and operations of non-first
     # interfaces need to be added.  Sometimes the attribute or operation is
     # defined in the current interface as well as a parent.  In that case we
     # avoid making a duplicate definition and pray that the signatures match.
     secondary_parents = self._TransitiveSecondaryParents(interface)
-    for parent_interface in secondary_parents:
+    for parent_interface in sorted(secondary_parents):
       if isinstance(parent_interface, str):  # IsDartCollectionType(parent_interface)
         continue
       for attr in sorted(parent_interface.attributes, ConstantOutputOrder):
         if not FindMatchingAttribute(interface, attr):
           self.AddSecondaryAttribute(parent_interface, attr)
 
       # Group overloaded operations by id
       operationsById = {}
       for operation in parent_interface.operations:
         if operation.id not in operationsById:
@@ skipping 692 matching lines @@
 
     library_emitter = self._multiemitter.FileEmitter(library_file_path)
     library_file_dir = os.path.dirname(library_file_path)
     auxiliary_dir = os.path.relpath(auxiliary_dir, library_file_dir)
     imports_emitter = library_emitter.Emit(
         self._template, AUXILIARY_DIR=massage_path(auxiliary_dir))
     for path in sorted(self._path_to_emitter.keys()):
       relpath = os.path.relpath(path, library_file_dir)
       imports_emitter.Emit(
           "part '$PATH';\n", PATH=massage_path(relpath))