Adding utility to display API differences between dart2js and dartium DOM libraries.

pkg/analyzer_experimental/lib/src/generated/ast.dart

 // 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.ast;
 
 import 'dart:collection';
 import 'java_core.dart';
 import 'java_engine.dart';
 import 'error.dart';
 import 'source.dart' show LineInfo;
@@ skipping 446 matching lines @@
    * Return an array containing the comment and annotations associated with this node, sorted in
    * lexical order.
    * @return the comment and annotations associated with this node in the order in which they
    * appeared in the original source
    */
   List<ASTNode> get sortedCommentAndAnnotations {
     List<ASTNode> childList = new List<ASTNode>();
     childList.add(_comment);
     childList.addAll(_metadata);
     List<ASTNode> children = new List.from(childList);
-    children.sort();
+    children.sort(ASTNode.LEXICAL_ORDER);
     return children;
   }
 }
 /**
  * Instances of the class {@code Annotation} represent an annotation that can be associated with an
  * AST node.
  * <pre>
  * metadata ::=
  * annotation
  * annotation ::=
@@ skipping 12840 matching lines @@
     return elements[elements.length - 1].endToken;
   }
   /**
    * Return the node that is the parent of each of the elements in the list.
    * @return the node that is the parent of each of the elements in the list
    */
   ASTNode getOwner() {
     return owner;
   }
 }