Make CompilerTask independent of compiler.

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 41 matching lines @@
 import 'class_members.dart' show MembersCreator;
 import 'constructors.dart';
 import 'members.dart';
 import 'registry.dart';
 import 'signatures.dart';
 import 'tree_elements.dart';
 import 'typedefs.dart';
 
 class ResolverTask extends CompilerTask {
   final ConstantCompiler constantCompiler;
+  final Compiler compiler;
 
-  ResolverTask(Compiler compiler, this.constantCompiler) : super(compiler);
+  ResolverTask(Compiler compiler, this.constantCompiler)
+      : compiler = compiler,
+        super(compiler.measurer);
 
   String get name => 'Resolver';
 
+  DiagnosticReporter get reporter => compiler.reporter;
+
   Resolution get resolution => compiler.resolution;
 
   ParsingContext get parsingContext => compiler.parsingContext;
 
   CoreClasses get coreClasses => compiler.coreClasses;
 
   CoreTypes get coreTypes => compiler.coreTypes;
 
   ResolutionImpact resolve(Element element) {
     return measure(() {
@@ skipping 1022 matching lines @@
   TreeElements get treeElements {
     assert(invariant(this, _treeElements != null,
         message: "TreeElements have not been computed for $this."));
     return _treeElements;
   }
 
   void reuseElement() {
     _treeElements = null;
   }
 }