src/vs/editor/browser/widget/codeEditorWidget.ts/CodeEditorWidget/_registerDecorationType
class CodeEditorWidget:	private _registerDecorationType(description: string, key: string, options: editorCommon.IDecorationRenderOptions, parentTypeKey?: string): void {
		this._codeEditorService.registerDecorationType(description, key, options, parentTypeKey, this);
	}