src/vs/workbench/api/common/extHostTreeViews.ts/ExtHostTreeViews/$changeCheckboxState
class ExtHostTreeViews:	$changeCheckboxState(treeViewId: string, checkboxUpdate: CheckboxUpdate[]): void {
		const treeView = this.treeViews.get(treeViewId);
		if (!treeView) {
			throw new Error(localize('treeView.notRegistered', 'No tree view with id \'{0}\' registered.', treeViewId));
		}
		treeView.setCheckboxState(checkboxUpdate);
	}