docs: public void resume() {
          new ExecutionChain(mGvrContext).runOnMainThread(new Runnable() {
              @Override
              public void run() {
                  if (!mContentSceneViewStack.isEmpty()) {
                      ContentScene contentScene = mContentSceneViewStack.peek();
                      contentScene.show();
                      WidgetLib.getTouchManager().setFlingHandler(
                              contentScene.getFlingHandler());
  
                  }
              }
          }).execute();
      }