(hidden) {
if (this._instance) {
var c$ = this._instance._children;
for (var i = 0; i < c$.length; i++) {
var c = c$[i];
c.style.display = hidden ? "none" : "";
c._hideTemplateChildren = hidden;
}
}
},
_forwardParentProp: function(prop, value) {
if (this._instance) {
this._instance[prop] = value;
}
},
_forwardParentPath: function(path, value) {
if (this._instance) {
this._instance.notifyPath(path, value, true);
}
}
});

Polymer.ImportStatus = {
_ready: false,
_callbacks: [],
whenLoaded: function(cb) {
if (t