Function toggleVisibility

test/unit/test-performance.js:882–887

(perf, on)

  }

  async function toggleVisibility(perf, on) {
    viewerVisibilityState = on
      ? VisibilityState_Enum.VISIBLE
      : VisibilityState_Enum.HIDDEN;
    perf.onAmpDocVisibilityChange_();
  }

  describe('should forward paint metrics for performance entries', () => {
    it('created before performance service registered', () => {