First step to resolving simple API changes.

pkg/analyzer/lib/src/generated/element_handle.dart

 // Copyright (c) 2014, 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 code was auto-generated, is not intended to be edited, and is subject to
 // significant change. Please see the README file for more information.
 
 library engine.element_handle;
 
+import 'package:analyzer/src/generated/utilities_collection.dart';
+
 import 'ast.dart';
 import 'element.dart';
 import 'engine.dart';
 import 'java_core.dart';
 import 'java_engine.dart';
 import 'source.dart';
 import 'utilities_dart.dart';
 
 /**
  * Instances of the class `ClassElementHandle` implement a handle to a `ClassElement`.
@@ skipping 252 matching lines @@
   ConstructorElement get redirectedConstructor =>
       actualElement.redirectedConstructor;
 }
 
 /**
  * The abstract class `ElementHandle` implements the behavior common to objects that implement
  * a handle to an [Element].
  */
 abstract class ElementHandle implements Element {
   /**
+   * The unique integer identifier of this element.
+   */
+  final int id = 0;
+
+  /**
    * The context in which the element is defined.
    */
   AnalysisContext _context;
 
   /**
    * The location of this element, used to reconstitute the element if it has been garbage
    * collected.
    */
   ElementLocation _location;
 
@@ skipping 75 matching lines @@
   @override
   AstNode get node => actualElement.node;
 
   @override
   Source get source => actualElement.source;
 
   @override
   CompilationUnit get unit => actualElement.unit;
 
   @override
+  IntSet get users => new IntSet();
+
+  @override
   bool operator ==(Object object) =>
       object is Element && object.location == _location;
 
   @override
   accept(ElementVisitor visitor) => actualElement.accept(visitor);
 
   @override
+  void addUser(Element element) {
+  }
+
+  @override
   String computeDocumentationComment() =>
       actualElement.computeDocumentationComment();
 
   @override
   Element getAncestor(Predicate<Element> predicate) =>
       actualElement.getAncestor(predicate);
 
   @override
   String getExtendedDisplayName(String shortName) =>
       actualElement.getExtendedDisplayName(shortName);
@@ skipping 678 matching lines @@
   DartType get type => actualElement.type;
 }
 /**
  * TODO(scheglov) invalid implementation
  */
 class WeakReference<T> {
   final T value;
   WeakReference(this.value);
   T get() => value;
 }