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

example/explainer/build_examples.dart

Index: example/explainer/build_examples.dart
diff --git a/example/explainer/build_examples.dart b/example/explainer/build_examples.dart
index 915b31251778cf893a6c141249b52307ceb46a69..ac1326373020633858d1924533afcffb538d846a 100755
--- a/example/explainer/build_examples.dart
+++ b/example/explainer/build_examples.dart
@@ -84,7 +84,7 @@ Stopwatch startTime() => new Stopwatch()..start();
 
 void stopTime(Stopwatch watch, String message) {
   watch.stop();
-  var duration = watch.elapsedInMs();
+  var duration = watch.elapsedMilliseconds;
   print('$message: $GREEN_COLOR$duration ms$NO_COLOR');
   totalTime.add('$message: $GREEN_COLOR$duration ms$NO_COLOR');
 }