merge to trunk all changes from 36817 until 37378 under the packages: polymer,

pkg/template_binding/lib/src/text_area_element.dart

Index: pkg/template_binding/lib/src/text_area_element.dart
===================================================================
--- pkg/template_binding/lib/src/text_area_element.dart	(revision 37373)
+++ pkg/template_binding/lib/src/text_area_element.dart	(working copy)
@@ -13,13 +13,12 @@
   Bindable bind(String name, value, {bool oneTime: false}) {
     if (name != 'value') return super.bind(name, value, oneTime: oneTime);
 
+    _node.attributes.remove(name);
     if (oneTime) {
       _InputBinding._updateProperty(_node, value, name);
       return null;
     }
 
-    _self.unbind(name);
-    _node.attributes.remove(name);
-    return bindings[name] = new _InputBinding(_node, value, name);
+    return _maybeUpdateBindings(name, new _InputBinding(_node, value, name));
   }
 }