Add new performance option

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';
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   /**
    * The [TimeCounter] for time spent in error verifier.
    */
   static TimeCounter errors = new TimeCounter();
 
   /**
    * The [TimeCounter] for time spent in hints generator.
    */
   static TimeCounter hints = new TimeCounter();
+
+  /**
+   * Reset all of the time counters to zero.
+   */
+  static void reset() {
+    io = new TimeCounter();
+    scan = new TimeCounter();
+    parse = new TimeCounter();
+    resolve = new TimeCounter();
+    angular = new TimeCounter();
+    errors = new TimeCounter();
+    hints = new TimeCounter();
+  }
 }
 
 /**
  * Instances of the class `RecordingErrorListener` implement an error listener that will
  * record the errors that are reported to it in a way that is appropriate for caching those errors
  * within an analysis context.
  */
 class RecordingErrorListener implements AnalysisErrorListener {
   /**
    * A HashMap of lists containing the errors that were collected, keyed by each [Source].
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   }
 
   @override
   void logInformation(String message) {
   }
 
   @override
   void logInformation2(String message, Exception exception) {
   }
 }