requestBlurSurface(id) {
    if (id != null) {
      if (!_.contains(this._blurSurfaceRequests, id)) {
        const numRequests = this._blurSurfaceRequests.length;
        this._blurSurfaceRequests.push(id);
        if (numRequests === 0 && this._blurSurfaceRequests.length === 1) {
          this.getEventBus().trigger(EVENTS.blur_surface_start, { type: EVENTS.blur_surface_start });
        }
      }
    } else {
      Logger.module('ENGINE').error('FX.requestBlurSurface -> requires id');
    }
  }
Request blur of surface/post processed content.
@param {String|Number|Integer} id