Prepare for decoupling analyzer ASTs from element model.

pkg/analysis_server/lib/src/computer/computer_highlights2.dart

 // Copyright (c) 2014, 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 computer.highlights2;
 
 import 'package:analysis_server/plugin/protocol/protocol.dart' hide Element;
 import 'package:analyzer/dart/ast/ast.dart';
+import 'package:analyzer/dart/ast/standard_resolution_map.dart';
 import 'package:analyzer/dart/ast/token.dart';
 import 'package:analyzer/dart/ast/visitor.dart';
 import 'package:analyzer/dart/element/element.dart';
 import 'package:analyzer/dart/element/type.dart';
 
 /**
  * A computer for [HighlightRegion]s in a Dart [CompilationUnit].
  */
 class DartUnitHighlightsComputer2 {
   final CompilationUnit _unit;
@@ skipping 402 matching lines @@
       Token a, Token b, HighlightRegionType type) {
     int offset = a.offset;
     int end = b.end;
     _addRegion(offset, end - offset, type);
   }
 
   static bool _isDynamicExpression(Expression e) {
     if (e is SimpleIdentifier && e.staticElement is PrefixElement) {
       return false;
     }
-    return e.bestType.isDynamic;
+    return resolutionMap.bestTypeForExpression(e).isDynamic;
   }
 }
 
 /**
  * An AST visitor for [DartUnitHighlightsComputer2].
  */
 class _DartUnitHighlightsComputerVisitor2 extends RecursiveAstVisitor<Object> {
   final DartUnitHighlightsComputer2 computer;
 
   _DartUnitHighlightsComputerVisitor2(this.computer);
@@ skipping 371 matching lines @@
   void _addRegions_functionBody(FunctionBody node) {
     Token keyword = node.keyword;
     if (keyword != null) {
       Token star = node.star;
       int offset = keyword.offset;
       int end = star != null ? star.end : keyword.end;
       computer._addRegion(offset, end - offset, HighlightRegionType.BUILT_IN);
     }
   }
 }