public void beforeDrawEyes() {
          mMainScene.resetStats();

          GVRNotifications.notifyBeforeStep();

          doMemoryManagementAndPerFrameCallbacks();

          try {
            GVRViewManager.this.getEventManager().sendEvent(mScript, IScriptEvents.class, "onStep");
          } catch (final Exception exc) {
            Log.e(TAG, "Exception from onStep: %s", exc.toString());
            exc.printStackTrace();
          }
        }
 @Override
 public void afterDrawEyes() {
   GVRNotifications.notifyAfterStep();
   mMainScene.updateStats();
 }