The Tor Browser / file revision

 /* 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);

 };