Start separating ClassElementImpl for Class and Enum.

pkg/analyzer/lib/src/context/context.dart

 // Copyright (c) 2015, 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 analyzer.src.context.context;
 
 import 'dart:async';
 import 'dart:collection';
 
 import 'package:analyzer/dart/ast/ast.dart';
@@ skipping 706 matching lines @@
   /**
    * Create a minimalistic mock dart:async library
    * to stand in for a real one if one does not exist
    * facilitating creation a type provider without dart:async.
    */
   LibraryElement createMockAsyncLib(LibraryElement coreLibrary) {
     InterfaceType objType = coreLibrary.getType('Object').type;
 
     ClassElement _classElement(String typeName, [List<String> parameterNames]) {
       ClassElementImpl element =
-          new ClassElementImpl.forNode(AstFactory.identifier3(typeName));
+          new ClassElementImpl_Class.forNode(AstFactory.identifier3(typeName));
       element.supertype = objType;
       InterfaceTypeImpl type = new InterfaceTypeImpl(element);
       element.type = type;
       if (parameterNames != null) {
         int count = parameterNames.length;
         if (count > 0) {
           List<TypeParameterElementImpl> typeParameters =
               new List<TypeParameterElementImpl>(count);
           List<TypeParameterTypeImpl> typeArguments =
               new List<TypeParameterTypeImpl>(count);
@@ skipping 1475 matching lines @@
     }
     DartSdk sdk = factory.dartSdk;
     if (sdk == null) {
       throw new IllegalArgumentException(
           "The source factory for an SDK analysis context must have a DartUriResolver");
     }
     return new AnalysisCache(
         <CachePartition>[AnalysisEngine.instance.partitionManager.forSdk(sdk)]);
   }
 }