Handle property definition by {cr|Object}.defineProperty() in compiler pass

ui/webui/resources/js/cr.js

Index: ui/webui/resources/js/cr.js
diff --git a/ui/webui/resources/js/cr.js b/ui/webui/resources/js/cr.js
index dbcbb828a5621ad664f3b685529cd16774b5ee8f..757039d56596b5b61a861de54df4c0f51a530d1c 100644
--- a/ui/webui/resources/js/cr.js
+++ b/ui/webui/resources/js/cr.js
@@ -75,17 +75,20 @@ var cr = function() {
     /**
      * Plain old JS property where the backing data is stored as a "private"
      * field on the object.
+     * Use for properties of any type. Type will not be checked.
      */
     JS: 'js',
 
     /**
      * The property backing data is stored as an attribute on an element.
+     * Use only for properties of type {string}.
      */
     ATTR: 'attr',
 
     /**
      * The property backing data is stored as an attribute on an element. If the
      * element has the attribute then the value is true.
+     * Use only for properties of type {boolean}.
      */
     BOOL_ATTR: 'boolAttr'
   };