src/vs/workbench/api/browser/mainThreadComments.ts/MainThreadCommentController/updateCommentThread
class MainThreadCommentController:	updateCommentThread(commentThreadHandle: number,
		threadId: string,
		resource: UriComponents,
		changes: CommentThreadChanges): void {
		let thread = this.getKnownThread(commentThreadHandle);
		thread.batchUpdate(changes);

		this._commentService.updateComments(this._uniqueId, {
			added: [],
			removed: [],
			changed: [thread]
		});
	}