src/vs/workbench/services/extensions/common/rpcProtocol.ts/RPCProtocol/_onWillSendRequest
class RPCProtocol:	private _onWillSendRequest(req: number): void {
		if (this._unacknowledgedCount === 0) {
			// Since this is the first request we are sending in a while,
			// mark this moment as the start for the countdown to unresponsive time
			this._unresponsiveTime = Date.now() + RPCProtocol.UNRESPONSIVE_TIME;
		}
		this._unacknowledgedCount++;
		if (!this._asyncCheckUresponsive.isScheduled()) {
			this._asyncCheckUresponsive.schedule();
		}
	}