Rename StopWatch to Stopwatch. Add new Stopwatch.start() and Stopwatch.reset().

frog/leg/scanner/scanner_bench.dart

 // Copyright (c) 2011, 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('scanner_bench');
 #import('scannerlib.dart');
 #import('scanner_implementation.dart');
 #source('source_list.dart');
 
 /**
  * A common superclass for scanner benchmarks.
  */
 class ScannerBench {
   void main(List<String> arguments) {
     for (String argument in arguments) {
       checkExistence(argument);
     }
     tokenizeAll(print, 10, arguments);
     tokenizeAll((x) {}, 1000, arguments);
     tokenizeAll(print, 10, arguments);
   }
 
   void tokenizeAll(void log(String s), int iterations, List<String> arguments) {
     ProgressBar bar = new ProgressBar(iterations);
     bar.begin();
     for (int i = 0; i < iterations; i++) {
       bar.tick();
-      StopWatch timer = new StopWatch();
+      Stopwatch timer = new Stopwatch();
       timer.start();
       int charCount = 0;
       for (final String argument in arguments) {
         charCount += tokenizeOne(argument);
       }
       timer.stop();
       log("Tokenized ${arguments.length} files (total size = ${charCount}) " +
           "in ${timer.elapsedInMs()}ms (bytes)");
     }
     bar.end();
@@ skipping 55 matching lines @@
     }
     ++ticks;
   }
 
   void end() {
     if (total > 10) {
       print("$up$clear[$hashes] 100%");
     }
   }
 }