A mixin which adds the 
    
Cesium3DTilesInspector widget to the Viewer widget.
Rather than being called directly, this function is normally passed as
a parameter to Viewer#extend, as shown in the example below.
| Name | Type | Description | 
|---|---|---|
viewer | 
            
            Viewer | The viewer instance. | 
Example:
var viewer = new Cesium.Viewer('cesiumContainer');
viewer.extend(Cesium.viewerCesium3DTilesInspectorMixin);
    
    
    
    
    
    
