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

lib/core/stopwatch.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.
 
 /**
  * A simple [Stopwatch] interface to measure elapsed time.
  */
 abstract class Stopwatch {
   /**
    * Creates a [Stopwatch] in stopped state with a zero elapsed count.
@@ skipping 27 matching lines @@
   void reset();
 
   /**
    * Returns the elapsed number of clock ticks since calling [start] while the
    * [Stopwatch] is running.
    * Returns the elapsed number of clock ticks between calling [start] and
    * calling [stop].
    * Returns 0 if the [Stopwatch] has never been started.
    * The elapsed number of clock ticks increases by [frequency] every second.
    */
-  int elapsed();
+  int get elapsedTicks;
 
   /**
-   * Returns the [elapsed] counter converted to microseconds.
+   * Returns the [elapsedTicks] counter converted to microseconds.
    */
-  int elapsedInUs();
+  int get elapsedMicroseconds;
 
   /**
-   * Returns the [elapsed] counter converted to milliseconds.
+   * Returns the [elapsedTicks] counter converted to milliseconds.
    */
-  int elapsedInMs();
+  int get elapsedMilliseconds;
 
   /**
    * Returns the frequency of the elapsed counter in Hz.
    */
-  int frequency();
-
+  int get frequency;
 }