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/usr/share/idl/thunderbird/nsIReflowObserver.idl is in thunderbird-dev 1:52.8.0-1~deb8u1.

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/* 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/. */

#include "domstubs.idl"

[scriptable, uuid(832e692c-c4a6-11e2-8fd1-dce678957a39)]
interface nsIReflowObserver : nsISupports
{
  /**
   * Called when an uninterruptible reflow has occurred.
   *
   * @param start timestamp when reflow ended, in milliseconds since
   *              navigationStart (accurate to 1/1000 of a ms)
   * @param end   timestamp when reflow ended, in milliseconds since
   *              navigationStart (accurate to 1/1000 of a ms)
   */
  void reflow(in DOMHighResTimeStamp start,
              in DOMHighResTimeStamp end);

  /**
   * Called when an interruptible reflow has occurred.
   *
   * @param start timestamp when reflow ended, in milliseconds since
   *              navigationStart (accurate to 1/1000 of a ms)
   * @param end   timestamp when reflow ended, in milliseconds since
   *              navigationStart (accurate to 1/1000 of a ms)
   */
  void reflowInterruptible(in DOMHighResTimeStamp start,
                           in DOMHighResTimeStamp end);
};