fix(scrolling): add ScrollingModule (#547)

Author: Splaktar

material.angular.io/src/assets/stackblitz/material-module.ts

@@ -1,4 +1,5 @@
 import {DragDropModule} from '@angular/cdk/drag-drop';
+import {ScrollingModule} from '@angular/cdk/scrolling';
 import {CdkTableModule} from '@angular/cdk/table';
 import {CdkTreeModule} from '@angular/cdk/tree';
 import {NgModule} from '@angular/core';
@@ -80,6 +81,7 @@ import {
     MatToolbarModule,
     MatTooltipModule,
     MatTreeModule,
+    ScrollingModule,
   ]
 })
 export class DemoMaterialModule {}