Add and use new proj4.register function

examples/scaleline-indiana-east.js

@@ -3,6 +3,7 @@ import _ol_View_ from '../src/ol/View.js';
 import ScaleLine from '../src/ol/control/ScaleLine.js';
 import _ol_layer_Tile_ from '../src/ol/layer/Tile.js';
 import {fromLonLat, transformExtent} from '../src/ol/proj.js';
+import {register} from '../src/ol/proj/proj4.js';
 import _ol_source_OSM_ from '../src/ol/source/OSM.js';
 
 proj4.defs('Indiana-East', 'PROJCS["IN83-EF",GEOGCS["LL83",DATUM["NAD83",' +
@@ -14,6 +15,7 @@ proj4.defs('Indiana-East', 'PROJCS["IN83-EF",GEOGCS["LL83",DATUM["NAD83",' +
     'PARAMETER["central_meridian",-85.66666666666670],' +
     'PARAMETER["latitude_of_origin",37.50000000000000],' +
     'UNIT["Foot_US",0.30480060960122]]');
+register(proj4);
 
 var map = new _ol_Map_({
   layers: [