src/vs/workbench/contrib/debug/browser/debugSession.ts/DebugSession/getNewCancellationToken
class DebugSession:	private getNewCancellationToken(threadId: number, token?: CancellationToken): CancellationToken {
		const tokenSource = new CancellationTokenSource(token);
		const tokens = this.cancellationMap.get(threadId) || [];
		tokens.push(tokenSource);
		this.cancellationMap.set(threadId, tokens);

		return tokenSource.token;
	}