src/vs/workbench/services/extensions/common/extensionHostManager.ts/ExtensionHostManager/measure
class ExtensionHostManager:	private async measure(): Promise<ExtHostLatencyResult | null> {
		const proxy = await this._proxy;
		if (!proxy) {
			return null;
		}
		const latency = await this._measureLatency(proxy);
		const down = await this._measureDown(proxy);
		const up = await this._measureUp(proxy);
		return {
			remoteAuthority: this._extensionHost.remoteAuthority,
			latency,
			down,
			up
		};
	}