message: Coalesced events (copied from ScrollEvent)
  Don't need to handle all events, just the latest is ok for scrolling
diff: @@ -58,6 +58,16 @@ public class NavigationBarView extends AppBarLayout {
  pool.release(this);
  }
  + @Override
  + public short getCoalescingKey() {
  + return 0;
  + }
  +
  + @Override
  + public boolean canCoalesce() {
  + return true;
  + }
  +
  @Override
  public String getEventName() {
  return "onOffsetChanged";
  