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

utils/template/tool.dart

Index: utils/template/tool.dart
diff --git a/utils/template/tool.dart b/utils/template/tool.dart
index 439c2630f12af3ce00d89e4954637fca533fa970..e9499623eee1523f1ed508993b916876951fe074 100644
--- a/utils/template/tool.dart
+++ b/utils/template/tool.dart
@@ -18,7 +18,7 @@ num time(callback()) {
   watch.start();
   callback();
   watch.stop();
-  return watch.elapsedInMs();
+  return watch.elapsedMilliseconds;
 }
 
 String GREEN_COLOR = '\u001b[32m';