src/vs/workbench/api/common/extHostDebugService.ts/ExtHostDebugServiceBase/$sendDAMessage
class ExtHostDebugServiceBase:	public $sendDAMessage(debugAdapterHandle: number, message: DebugProtocol.ProtocolMessage): void {

		// VS Code -> DA
		message = convertToDAPaths(message, false);

		const tracker = this._debugAdaptersTrackers.get(debugAdapterHandle);	// TODO@AW: same handle?
		if (tracker && tracker.onWillReceiveMessage) {
			tracker.onWillReceiveMessage(message);
		}

		const da = this._debugAdapters.get(debugAdapterHandle);
		da?.sendMessage(message);
	}