From 528129cf83e04fae2a1ccf64666b655941df1fa5 Mon Sep 17 00:00:00 2001
From: "Scott J. Miles" <sjmiles@google.com>
Date: Mon, 9 Sep 2013 09:59:41 -0700
Subject: [PATCH] add 'onMutation' (experimental) function to Base

---
 src/instance/base.js | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/src/instance/base.js b/src/instance/base.js
index 5ee15a26cf..880595d320 100644
--- a/src/instance/base.js
+++ b/src/instance/base.js
@@ -145,6 +145,13 @@
       if (this.attributeChanged) {
         this.attributeChanged.apply(this, arguments);
       }
+    },
+    onMutation: function(node, listener) {
+      var observer = new MutationObserver(function() {
+        listener.call(this, observer);
+        observer.disconnect();
+      }.bind(this));
+      observer.observe(node, {childList: true, subtree: true});
     }
   };