Make CompilerTask independent of compiler.

pkg/compiler/lib/src/js_backend/codegen/task.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.
 
 /// Generate code using the cps-based IR pipeline.
 library code_generator_task;
 
 import 'glue.dart';
 import 'codegen.dart';
 import 'unsugar.dart';
@@ skipping 50 matching lines @@
 
   CpsFunctionCompiler(Compiler compiler, JavaScriptBackend backend,
       SourceInformationStrategy sourceInformationFactory)
       : fallbackCompiler =
             new ssa.SsaFunctionCompiler(backend, sourceInformationFactory),
         cpsBuilderTask = new IrBuilderTask(compiler, sourceInformationFactory),
         sourceInformationFactory = sourceInformationFactory,
         constantSystem = backend.constantSystem,
         compiler = compiler,
         glue = new Glue(compiler),
-        cpsOptimizationTask = new GenericTask('CPS optimization', compiler),
-        treeBuilderTask = new GenericTask('Tree builder', compiler),
-        treeOptimizationTask = new GenericTask('Tree optimization', compiler) {
+        cpsOptimizationTask =
+            new GenericTask('CPS optimization', compiler.measurer),
+        treeBuilderTask = new GenericTask('Tree builder', compiler.measurer),
+        treeOptimizationTask =
+            new GenericTask('Tree optimization', compiler.measurer) {
     inliner = new Inliner(this);
   }
 
   String get name => 'CPS Ir pipeline';
 
   JavaScriptBackend get backend => compiler.backend;
 
   DiagnosticReporter get reporter => compiler.reporter;
 
   /// Generates JavaScript code for `work.element`.
@@ skipping 263 matching lines @@
       treeOptimizationTask
     ]..addAll(fallbackCompiler.tasks);
   }
 
   js.Node attachPosition(js.Node node, ResolvedAst resolvedAst) {
     return node.withSourceInformation(sourceInformationFactory
         .createBuilderForContext(resolvedAst)
         .buildDeclaration(resolvedAst));
   }
 }