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

pkg/analyzer_experimental/lib/src/generated/constant.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.constant;
 
 import 'java_core.dart';
 import 'source.dart' show Source;
 import 'error.dart' show AnalysisError, ErrorCode, CompileTimeErrorCode;
 import 'scanner.dart' show TokenType;
 import 'ast.dart';
@@ skipping 175 matching lines @@
    * whose value needs to be computed.
    * @param unit the compilation unit defining the constant variables to be added
    */
   void add(CompilationUnit unit) {
     unit.accept(_constantFinder);
   }
   /**
    * Compute values for all of the constant variables in the compilation units that were added.
    */
   void computeValues() {
+    return;
     _declarationMap = _constantFinder.variableMap;
     for (MapEntry<VariableElement, VariableDeclaration> entry in getMapEntrySet(_declarationMap)) {
       VariableElement element = entry.getKey();
       ReferenceFinder referenceFinder = new ReferenceFinder(element, _referenceGraph);
       _referenceGraph.addNode(element);
       entry.getValue().initializer.accept(referenceFinder);
     }
     while (!_referenceGraph.isEmpty()) {
       VariableElement element = _referenceGraph.removeSink();
       while (element != null) {
@@ skipping 1206 matching lines @@
    * @param value the value to be represented as a result object
    * @return a result object representing the given value
    */
   ValidResult valueOf3(double value) => new ValidResult(value);
   /**
    * Return a result object representing the given value.
    * @param value the value to be represented as a result object
    * @return a result object representing the given value
    */
   ValidResult valueOf4(String value) => new ValidResult(value);
-}
+}