Add timing info for file IO into Dart based analyzer.

pkg/analyzer/lib/src/generated/engine.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.
 
 // This code was auto-generated, is not intended to be edited, and is subject to
 // significant change. Please see the README file for more information.
 
 library engine;
 
 import 'java_core.dart';
@@ skipping 8583 matching lines @@
 /**
  * Container with global [AnalysisContext] performance statistics.
  */
 class PerformanceStatistics {
   /**
    * The [TimeCounter] for time spent in Angular analysis.
    */
   static TimeCounter angular = new TimeCounter();
 
   /**
+   * The [TimeCounter] for time spent in reading files.
+   */
+  static TimeCounter io = new TimeCounter();
+
+  /**
    * The [TimeCounter] for time spent in scanning.
    */
   static TimeCounter scan = new TimeCounter();
 
   /**
    * The [TimeCounter] for time spent in parsing.
    */
   static TimeCounter parse = new TimeCounter();
 
   /**
@@ skipping 3105 matching lines @@
 
   void logError2(String message, Exception exception) {
   }
 
   void logInformation(String message) {
   }
 
   void logInformation3(String message, Exception exception) {
   }
 }