private void skipVideoForward() {
   mSeekListener.onProgressChanged(mProgress, forwardSkippingUnit(), true);
 }
 private void skipVideoBackwards() {
   mSeekListener.onProgressChanged(mProgress, backwardSkippingUnit(), true);
 }
 private void updateVideoProgressBar(float delta) {
   mSeekListener.onProgressChanged(mProgress, extractHorizontalDeltaScale(delta, mProgress), true);
 }