diff -r 000000000000 -r 6474c204b198 dom/interfaces/base/nsIFrameRequestCallback.idl
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/dom/interfaces/base/nsIFrameRequestCallback.idl	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,18 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+/**
+ * Interface that represents a callback to be passed to requestAnimationFrame
+ */
+
+#include "domstubs.idl"
+
+[scriptable, function, uuid(e8d887f0-2ed7-406f-9f1d-edeb2c54c0a2)]
+interface nsIFrameRequestCallback : nsISupports
+{
+  /**
+   * The timestamp is the time to be used for the animation sample.
+   */
+  void sample(in DOMTimeStamp timeStamp);
+};