big update to observe, template_binding, polymer

pkg/template_binding/lib/src/input_element.dart

Index: pkg/template_binding/lib/src/input_element.dart
diff --git a/pkg/template_binding/lib/src/input_element.dart b/pkg/template_binding/lib/src/input_element.dart
index a599f24277a3a43cb19d4f3de1938a93e8d5b649..03fe6bc5b30b087cf209fd3df1a8d39a719d7a9d 100644
--- a/pkg/template_binding/lib/src/input_element.dart
+++ b/pkg/template_binding/lib/src/input_element.dart
@@ -10,15 +10,17 @@ class _InputElementExtension extends _ElementExtension {
 
   InputElement get _node => super._node;
 
-  NodeBinding bind(String name, model, [String path]) {
+  bind(String name, value, {bool oneTime: false}) {
     if (name != 'value' && name != 'checked') {
-      return super.bind(name, model, path);
+      return super.bind(name, value, oneTime: oneTime);
     }
 
-    _self.unbind(name);
     _node.attributes.remove(name);
-    return bindings[name] = name == 'value' ?
-        new _ValueBinding(_node, model, path) :
-        new _CheckedBinding(_node, model, path);
+    if (oneTime) {
+      return _InputBinding._updateProperty(_node, value, name);
+    }
+
+    _self.unbind(name);
+    return bindings[name] = new _InputBinding(_node, value, name);
   }
 }