Add timing info for file IO into Dart based analyzer.

pkg/analyzer/lib/src/generated/source_io.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.source.io;
 
 import 'source.dart';
 import 'java_core.dart';
 import 'java_io.dart';
-import 'engine.dart' show AnalysisContext, AnalysisEngine, TimestampedData;
+import 'engine.dart';
+import 'utilities_general.dart';
 export 'source.dart';
 
 /**
  * Instances of interface `LocalSourcePredicate` are used to determine if the given
  * [Source] is "local" in some sense, so can be updated.
  *
  * @coverage dart.engine.source
  */
 abstract class LocalSourcePredicate {
   /**
@@ skipping 70 matching lines @@
    */
   FileBasedSource.con2(JavaFile file, UriKind uriKind) {
     this._file = file;
     this._uriKind = uriKind;
   }
 
   bool operator ==(Object object) => object != null && this.runtimeType == object.runtimeType && _file == (object as FileBasedSource)._file;
 
   bool exists() => _file.isFile();
 
-  TimestampedData<String> get contents => contentsFromFile;
+  TimestampedData<String> get contents {
+    TimeCounter_TimeCounterHandle handle = PerformanceStatistics.io.start();
+    try {
+      return contentsFromFile;
+    } finally {
+      handle.stop();
+    }
+  }
 
   void getContentsToReceiver(Source_ContentReceiver receiver) {
-    getContentsFromFileToReceiver(receiver);
+    TimeCounter_TimeCounterHandle handle = PerformanceStatistics.io.start();
+    try {
+      getContentsFromFileToReceiver(receiver);
+    } finally {
+      handle.stop();
+    }
   }
 
   String get encoding {
     if (_encoding == null) {
       _encoding = "${_uriKind.encoding}${_file.toURI().toString()}";
     }
     return _encoding;
   }
 
   String get fullName => _file.getAbsolutePath();
@@ skipping 300 matching lines @@
     return null;
   }
 
   Source resolveAbsolute(Uri uri) {
     if (!isFileUri(uri)) {
       return null;
     }
     return new FileBasedSource.con1(new JavaFile.fromUri(uri));
   }
 }