code: public void start()
      {
          if (mAnimations.size() == 0)
          {
              return;
          }
          mIsRunning = true;
          for (GVRAnimation anim : mAnimations)
          {
              anim.start(getGVRContext().getAnimationEngine());
          }
      }
docs: Starts all of the animations in this animator.
  @see GVRAnimator#reset()
  @see GVRAnimationEngine#start(GVRAnimation)