Add an element for mixin applications. For now, the resolver complains about mixin applications -- …

sdk/lib/_internal/compiler/implementation/elements/elements.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 elements;
 
 import 'dart:uri';
 
 import 'modelx.dart';
 import '../tree/tree.dart';
@@ skipping 10 matching lines @@
                                  FunctionType,
                                  SourceString,
                                  Selector,
                                  Constant,
                                  Compiler;
 
 import '../scanner/scannerlib.dart' show Token,
                                          isUserDefinableOperator,
                                          isMinusOperator;
 
-
 const int STATE_NOT_STARTED = 0;
 const int STATE_STARTED = 1;
 const int STATE_DONE = 2;
 
 class ElementCategory {
   /**
    * Represents things that we don't expect to find when looking in a
    * scope.
    */
   static const int NONE = 0;
@@ skipping 709 matching lines @@
   Element get annotatedElement;
   int get resolutionState;
   Token get beginToken;
 
   // TODO(kasperl): Try to get rid of these.
   void set annotatedElement(Element value);
   void set resolutionState(int value);
 
   MetadataAnnotation ensureResolved(Compiler compiler);
 }