Fix importHref externs signature and add it to Polymer.Base too.
@@ -527,6 +527,15 @@ Polymer.Base.extend = function(target, source) {};
*/
Polymer.Base.getPropertyInfo = function(property) {};
+/**
+ * Dynamically imports an HTML document.
+ * @param {string} href
+ * @param {Function=} onload
+ * @param {Function=} onerror
+ * @param {boolean=} async
+ */
+Polymer.Base.importHref = function(href, onload, onerror, async) {};
+
/**
* Copies props from a source object to a target object.
*
@@ -671,8 +680,9 @@ PolymerElement.prototype.translate3d = function(x, y, z, node) {};
* @param {string} href
* @param {Function=} onload
* @param {Function=} onerror
+ * @param {boolean=} async
*/
-PolymerElement.prototype.importHref = function(href, onload, onerror) {};
+PolymerElement.prototype.importHref = function(href, onload, onerror, async) {};
/**
* Checks whether an element is in this element's light DOM tree.
