Make methods in Stopwatch getters and rename to be more consistent.

lib/coreimpl/stopwatch_implementation.dart

 // Copyright (c) 2012, 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.
 
 /**
  * A simple implementation of the [Stopwatch] interface.
  */
 class StopwatchImplementation implements Stopwatch {
   // The _start and _stop fields capture the time when [start] and [stop]
   // are called respectively.
@@ skipping 32 matching lines @@
     // If [_start] is not null, then the stopwatch had already been started. It
     // may running right now.
     _start = _now();
     if (_stop !== null) {
       // The watch is not running. So simply set the [_stop] to [_start] thus
       // having an elapsed time of 0.
       _stop = _start;
     }
   }
 
-  int elapsed() {
+  int get elapsedTicks {
     if (_start === null) {
       return 0;
     }
     return (_stop === null) ? (_now() - _start) : (_stop - _start);
   }
 
-  int elapsedInUs() {
-    return (elapsed() * 1000000) ~/ frequency();
+  int get elapsedMicroseconds {
+    return (elapsedTicks * 1000000) ~/ frequency;
   }
 
-  int elapsedInMs() {
-    return (elapsed() * 1000) ~/ frequency();
+  int get elapsedMilliseconds {
+    return (elapsedTicks * 1000) ~/ frequency;
   }
 
-  int frequency() => _frequency();
+  int get frequency => _frequency();
 
   external static int _frequency();
   external static int _now();
 }