Add Accessor, Getter, and Setter elements.

pkg/compiler/lib/src/resolution/resolution.dart

 // 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.
 
 library resolution;
 
 import 'dart:collection' show Queue;
 
 import '../compile_time_constants.dart';
 import '../constants/expressions.dart';
@@ skipping 17 matching lines @@
     FormalElementX,
     FunctionElementX,
     FunctionSignatureX,
     InitializingFormalElementX,
     JumpTargetX,
     LabelDefinitionX,
     LocalFunctionElementX,
     LocalParameterElementX,
     LocalVariableElementX,
     MetadataAnnotationX,
+    MethodElementX,
     MixinApplicationElementX,
     ParameterElementX,
     ParameterMetadataAnnotation,
     SynthesizedConstructorElementX,
     TypeVariableElementX,
     TypedefElementX,
     VariableElementX,
     VariableList;
 
 import '../ordered_typeset.dart' show OrderedTypeSet, OrderedTypeSetBuilder;
 import '../util/util.dart';
 import '../universe/universe.dart' show CallStructure;
 
 import 'class_members.dart' show MembersCreator;
 import 'enum_creator.dart';
 import 'secret_tree_element.dart' show getTreeElement, setTreeElement;
 
 part 'members.dart';
 part 'registry.dart';
 part 'scope.dart';
 part 'signatures.dart';