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

pkg/template_binding/lib/src/input_element.dart

Index: pkg/template_binding/lib/src/input_element.dart
===================================================================
--- pkg/template_binding/lib/src/input_element.dart	(revision 37373)
+++ pkg/template_binding/lib/src/input_element.dart	(working copy)
@@ -21,7 +21,8 @@
       return null;
     }
 
-    _self.unbind(name);
-    return bindings[name] = new _InputBinding(_node, value, name);
+    // Note: call _updateBindings to always store binding reflection, because
+    // checkboxes may need to update bindings of other checkboxes.
+    return _updateBindings(name, new _InputBinding(_node, value, name));
   }
 }