Fix dwc extension with latest js-interop, small fix to dwc, and updates to

lib/src/utils.dart

Index: lib/src/utils.dart
diff --git a/lib/src/utils.dart b/lib/src/utils.dart
index 2f482f0f45255d675e5c2f5c371763e26f7c6763..06bfbf69c2165fb934236c14c096d15c43d44739 100644
--- a/lib/src/utils.dart
+++ b/lib/src/utils.dart
@@ -33,7 +33,7 @@ time(String logMessage, callback(), {bool printTime: false}) {
   watch.start();
   var result = callback();
   watch.stop();
-  final duration = watch.elapsedInMs();
+  final duration = watch.elapsedMilliseconds;
   if (printTime) {
     _printMessage(logMessage, duration);
   }
@@ -52,7 +52,7 @@ Future asyncTime(String logMessage, Future callback(),
   watch.start();
   return callback()..then((_) {
     watch.stop();
-    final duration = watch.elapsedInMs();
+    final duration = watch.elapsedMilliseconds;
     if (printTime) {
       _printMessage(logMessage, duration);
     }