Merge pull request #8195 from AnalyticalGraphicsInc/kml-defer-loading

When loading KML documents we will spread out loading to prevent freezing

Author: mramato

CHANGES.md

@@ -25,6 +25,7 @@ Change Log
 * Fixed per-feature post processing from sometimes selecting the wrong feature. [#7929](https://github.com/AnalyticalGraphicsInc/cesium/pull/7929)
 * Fixed labels not showing for individual entities in data sources when clustering is enabled. [#6087](https://github.com/AnalyticalGraphicsInc/cesium/issues/6087)
 * Fixed a crash for 3D Tiles that have zero volume. [#7945](https://github.com/AnalyticalGraphicsInc/cesium/pull/7945)
+* Spread out KMl loading across multiple frames to prevent freezing. [#8195](https://github.com/AnalyticalGraphicsInc/cesium/pull/8195)
 * Fixed a bug where dynamic polylines did not use the given arcType. [#8191](https://github.com/AnalyticalGraphicsInc/cesium/issues/8191)
 * Fixed an issue where polygons, corridors, rectangles, and ellipses on terrain would not render on some mobile devices. [#6739](https://github.com/AnalyticalGraphicsInc/cesium/issues/6739)
 * Fixed a bug where GlobeSurfaceTile would not render the tile until all layers completed loading causing globe to appear to hang. [#7974](https://github.com/AnalyticalGraphicsInc/cesium/issues/7974)