since preloadWhenHidden piggy backing off prefetch pass but doesn't need to be prioritized, adding check to make sure that doesn't happen
since preloadWhenHidden piggy backing off prefetch pass but doesn't need to be prioritized, adding check to make sure that doesn't happen

likangning93/cesium,YonatanKra/cesium,CesiumGS/cesium,YonatanKra/cesium,geoscan/cesium,AnalyticalGraphicsInc/cesium,jasonbeverage/cesium,likangning93/cesium,CesiumGS/cesium,likangning93/cesium,likangning93/cesium,YonatanKra/cesium,CesiumGS/cesium,josh-bernstein/cesium,progsung/cesium,CesiumGS/cesium,progsung/cesium,jasonbeverage/cesium,geoscan/cesium,AnalyticalGraphicsInc/cesium,likangning93/cesium,josh-bernstein/cesium,CesiumGS/cesium,YonatanKra/cesium