Frog dart:dom using interfaces and native implementation classes.

client/dom/generated/src/frog/HTMLTrackElement.dart

Index: client/dom/generated/src/frog/HTMLTrackElement.dart
diff --git a/client/dom/generated/src/frog/HTMLTrackElement.dart b/client/dom/generated/src/frog/HTMLTrackElement.dart
index 2a48ec15cea366fb77cd1cd8d98f85e05c7a1774..f17120a9d03c1319c1785d365d932c77fce62401 100644
--- a/client/dom/generated/src/frog/HTMLTrackElement.dart
+++ b/client/dom/generated/src/frog/HTMLTrackElement.dart
@@ -1,5 +1,5 @@
 
-class HTMLTrackElement extends HTMLElement native "*HTMLTrackElement" {
+class HTMLTrackElementJS extends HTMLElementJS implements HTMLTrackElement native "*HTMLTrackElement" {
 
   static final int ERROR = 3;
 
@@ -31,5 +31,5 @@ class HTMLTrackElement extends HTMLElement native "*HTMLTrackElement" {
 
   void set srclang(String value) native "this.srclang = value;";
 
-  TextTrack get track() native "return this.track;";
+  TextTrackJS get track() native "return this.track;";
 }