Support enums in dart2js.

tests/compiler/dart2js/mock_compiler.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 mock_compiler;
 
 import "package:expect/expect.dart";
 import 'dart:async';
 import 'dart:collection';
 
@@ skipping 55 matching lines @@
        int maxConcreteTypeSize: 5,
        bool disableTypeInference: false,
        bool analyzeAll: false,
        bool analyzeOnly: false,
        bool emitJavaScript: true,
        bool preserveComments: false,
        // Our unit tests check code generation output that is
        // affected by inlining support.
        bool disableInlining: true,
        bool trustTypeAnnotations: false,
+       bool enableEnums: false,
        int this.expectedWarnings,
        int this.expectedErrors})
       : sourceFiles = new Map<String, SourceFile>(),
         super(enableTypeAssertions: enableTypeAssertions,
               enableMinification: enableMinification,
               enableConcreteTypeInference: enableConcreteTypeInference,
               maxConcreteTypeSize: maxConcreteTypeSize,
               disableTypeInferenceFlag: disableTypeInference,
               analyzeAllFlag: analyzeAll,
               analyzeOnly: analyzeOnly,
               emitJavaScript: emitJavaScript,
               preserveComments: preserveComments,
               trustTypeAnnotations: trustTypeAnnotations,
-              showPackageWarnings: true) {
+              showPackageWarnings: true,
+              enableEnums: enableEnums) {
     this.disableInlining = disableInlining;
 
     deferredLoadTask = new MockDeferredLoadTask(this);
 
     clearMessages();
 
     registerSource(Compiler.DART_CORE,
                    buildLibrarySource(DEFAULT_CORE_LIBRARY, coreSource));
     registerSource(PATCH_CORE, DEFAULT_PATCH_CORE_SOURCE);
 
@@ skipping 162 matching lines @@
   }
 
   Element lookupElementIn(ScopeContainerElement container, name) {
     Element element = container.localLookup(name);
     return element != null
         ? element
         : new ErroneousElementX(null, null, name, container);
   }
 
   /// Create a new [MockCompiler] and apply it asynchronously to [f].
-  static Future create(f(MockCompiler compiler)) {
-    MockCompiler compiler = new MockCompiler.internal();
+  static Future create(f(MockCompiler compiler),
+                       {bool enableEnums: false}) {
+    MockCompiler compiler = new MockCompiler.internal(
+        enableEnums: enableEnums);
     return compiler.init().then((_) => f(compiler));
   }
 }
 
 /// A function the checks [message]. If the check fails or if [message] is
 /// `null`, an error string is returned. Otherwise `null` is returned.
 typedef String CheckMessage(Message message);
 
 CheckMessage checkMessage(MessageKind kind, Map arguments) {
   return (Message message) {
@@ skipping 105 matching lines @@
   MockElement(Element enclosingElement)
       : super('', ElementKind.FUNCTION, Modifiers.EMPTY,
               enclosingElement, false);
 
   get node => null;
 
   parseNode(_) => null;
 
   bool get hasNode => false;
 }