Ensure _listen is called on rootDataHost, for possible behavior overr…

…iding.

src/lib/template/templatizer.html

@@ -249,14 +249,16 @@
       this._tryReady();
     },
 
+    // Decorate events with model (template instance)
     _listenImpl: function(node, eventName, methodName) {
       var model = this;
-      var handler = this._createEventHandler(this._rootDataHost, methodName);
+      var host = this._rootDataHost;
+      var handler = host._createEventHandler(methodName);
       var decorated = function(e) {
         e.model = model;
         handler(e);
       };
-      this._listen(node, eventName, decorated);
+      host._listen(node, eventName, decorated);
     },
 
     _scopeElementClassImpl: function(node, value) {

src/standard/events.html

@@ -61,10 +61,11 @@
     },
 
     listen: function(node, eventName, methodName) {
-      this._listen(node, eventName, this._createEventHandler(this, methodName));
+      this._listen(node, eventName, this._createEventHandler(methodName));
     },
 
-    _createEventHandler: function(host, methodName) {
+    _createEventHandler: function(methodName) {
+      var host = this;
       return function(e) {
         if (host[methodName]) {
           host[methodName](e, e.detail);