@Override
  public void onFrameDropped(BitmapAnimationBackend backend, int frameNumber) {
    mDroppedFrameCount++;
    FLog.d(
        TAG,
        "Frame: event=dropped, number=%d, render_time=%d ms",
        frameNumber,
        System.currentTimeMillis() - mLastFrameStart);
    logStatistics();
  }
{@link com.facebook.fresco.animation.bitmap.BitmapAnimationBackend.FrameListener} that logs
animation statistics.
samples/animation2/src/main/java/com/facebook/samples/animation2/bitmap/DebugBitmapAnimationFrameListener.java