Use runAsync() when perform request.

pkg/analyzer_cli/lib/src/build_mode.dart

 // Copyright (c) 2015, 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 analyzer_cli.src.build_mode;
 
 import 'dart:async';
 import 'dart:io' as io;
 
 import 'package:analyzer/error/error.dart';
@@ skipping 63 matching lines @@
         logger: logger, packageBundleProvider: packageBundleProvider);
     await buildMode.analyze();
     AnalysisEngine.instance.clearCaches();
   }
 
   /**
    * Perform a single loop step.
    */
   @override
   Future<WorkResponse> performRequest(WorkRequest request) async {
-    return logger.run('Perform request', () async {
+    return logger.runAsync('Perform request', () async {
       errorBuffer.clear();
       outBuffer.clear();
       try {
         // Prepare inputs with their digests.
         Map<String, WorkerInput> inputs = {};
         for (var input in request.inputs) {
           inputs[input.path] = new WorkerInput(input.path, input.digest);
         }
 
         // Add in the dart-sdk argument if `dartSdkPath` is not null,
@@ skipping 549 matching lines @@
   final WorkerPackageBundleCache cache;
   final Map<String, WorkerInput> inputs;
 
   WorkerPackageBundleProvider(this.cache, this.inputs);
 
   @override
   PackageBundle get(String path) {
     return cache.get(inputs, path);
   }
 }