src/vs/workbench/api/common/extHostComments.ts/ExtHostCommentController/constructor
class ExtHostCommentController:	constructor(
		private _extension: IExtensionDescription,
		private _handle: number,
		private _proxy: MainThreadCommentsShape,
		private _id: string,
		private _label: string
	) {
		this._proxy.$registerCommentController(this.handle, _id, _label);
	}