fix findController for non-dart elements

pkg/polymer/lib/src/events.dart

Index: pkg/polymer/lib/src/events.dart
diff --git a/pkg/polymer/lib/src/events.dart b/pkg/polymer/lib/src/events.dart
index 881728a65c80619c0f5b6ff4d7480956229d3b5a..33905c1c4985e08dc9473707399f810c1978435e 100644
--- a/pkg/polymer/lib/src/events.dart
+++ b/pkg/polymer/lib/src/events.dart
@@ -52,6 +52,12 @@ abstract class PolymerEventBindings {
     while (node.parentNode != null) {
       if (node is Polymer && node.eventController != null) {
         return node.eventController;
+      } else if (node.nodeName.contains('-')){

[Siggi Cherem (dart-lang), 2014/09/18 18:10:58]

as we discussed, let's switch to:
 - check is Element
 - use e.localName
 - check attributes['is'] as well

[jakemac, 2014/09/18 18:17:07]

Done.

+        // Looks like a custom node, but not a dart one. Try getting the
+        // eventController through js interop.
+        var eventController =
+            new JsObject.fromBrowserObject(node)['eventController'];
+        if (eventController != null) return eventController;
       }
       node = node.parentNode;
     }