src/vs/workbench/contrib/debug/browser/debugSession.ts/DebugSession/stackTrace
class DebugSession:	stackTrace(threadId: number, startFrame: number, levels: number, token: CancellationToken): Promise<DebugProtocol.StackTraceResponse | undefined> {
		if (!this.raw) {
			throw new Error(localize('noDebugAdapter', "No debugger available, can not send '{0}'", 'stackTrace'));
		}

		const sessionToken = this.getNewCancellationToken(threadId, token);
		return this.raw.stackTrace({ threadId, startFrame, levels }, sessionToken);
	}