getRenderContext(frameState) {
    if (frameState.declutter && !this.deferredContext_) {
      this.deferredContext_ = new ZIndexContext();
    }
    return frameState.declutter
      ? this.deferredContext_.getContext()
      : this.context;
  }
@param {import("../../Map.js").FrameState} frameState Frame state.
@return {import('../../render/canvas/ZIndexContext.js').ZIndexContextProxy} Context.