Use packages dart_parser, dart_scanner, and compiler_util.

pkg/compiler/lib/src/resolution/resolution.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 dart2js.resolution;
 
 import 'dart:collection' show Queue;
 
 import '../common.dart';
 import '../common/names.dart' show Identifiers;
@@ skipping 19 matching lines @@
         FieldElementX,
         FunctionElementX,
         GetterElementX,
         MetadataAnnotationX,
         MixinApplicationElementX,
         ParameterMetadataAnnotation,
         SetterElementX,
         TypedefElementX;
 import '../enqueue.dart';
 import '../options.dart';
-import '../tokens/token.dart'
+import 'package:dart_scanner/dart_scanner.dart'
     show
         isBinaryOperator,
         isMinusOperator,
         isTernaryOperator,
         isUnaryOperator,
         isUserDefinableOperator;
 import '../tree/tree.dart';
 import '../universe/call_structure.dart' show CallStructure;
 import '../universe/feature.dart' show Feature;
 import '../universe/use.dart' show StaticUse, TypeUse;
@@ skipping 1087 matching lines @@
   TreeElements get treeElements {
     assert(invariant(this, _treeElements != null,
         message: "TreeElements have not been computed for $this."));
     return _treeElements;
   }
 
   void reuseElement() {
     _treeElements = null;
   }
 }